Seahorse Club
Aquarium & Livestock

Feed Ezy Frozen Mysis

Seahorse Club
Aquarium & Livestock

Feed Ezy Frozen Mysis

Seahorse Club
Aquarium & Livestock

Feed Ezy Frozen Mysis

Seahorse Club
Aquarium & Livestock

Feed Ezy Frozen Mysis

Seahorse Club
Aquarium & Livestock

Feed Ezy Frozen Mysis

Seahorse Club
Aquarium & Livestock

Feed Ezy Frozen Mysis

Vibrio outbreak?

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    Dear Pete, dear all,

    some time ago I posted because of a capensis male who was suffering from gas bubbles – he is fine ever since, thanks to your help.

    Now I have a massive problem with my fuscus tank. We have the fuscus for over a year – they have had some fries already, two of which we raised successfully. There are also 4 reidis in the tank, two of them came two months ago (I had them in a separate tank first). They eat live mysis but some three weeks ago we decided to try to offer them some frozen mysis, too, because the CB reidis were used to frozen food. Soon after that I noticed that one or two of the fuscus had a whitish output. I got worried because I had this problem once with the babies which died. Some days after this I noticed that one male had got stuck between two stones (that had never happened earlier). We got him out but he had some erosions on his pouch and his tail. We thought that he had hurt himself, put him into a hospital tank where he unfortunately died on the next day. Soon after that I noticed three femals who had stiff tails and did not want to eat. We consulted Internet and tried to treat them with Aquafuran containing Nifurprinol – with no success. The tails get white and slimy, there are whitish lines on the bodies of the seahorses, meanwhile four have died and all the fuscus seem to be infected. The reidis are doing fine as are the mandarin fishes that live in the tank, too (a while ago one mandarin went pale and whitish and his tail and fins were broken but he recovered after we treated him with vitamins for a while). We add vitamins to the tank now, too, we have stopped with the frozen food, the temperature is 71,5F (we lowered it some four weeks ago), the water parameters are ok. but the fuscus (also those who look fine) stopped eating and I am afraid we will loose all of them. Is this vibriosis? Do you know if there is something I can do for them? We are performing a big water change today (50%).
    Any help would be greatly appreciated.

    Warm regards,
    Elina from Germany

    Pete Giwojna

    Dear Elina:

    I’m very sorry to hear about the problems you are having with your Hippocampus fuscus. They are among my favorite seahorses and are very hard to come by here in the US. If the only seahorse that has developed ulcerations or open lesions is the male that was stuck between two rocks and may have injured himself, leading to infection at the sight of his wounds, then I do not think you are dealing with Vibriosis. With Vibrio infections, also known as marine ulcer disease, we expect to see those open sores and bloody lesions in most all of the affected specimens.

    The condition you are describing sounds more like White Patch Disease or Marine Columnaris, which is a different type of bacterial infection caused by Myxobacteria. A white, slimy coating and/or white lines are strings on the body are very characteristic of this condition, and the whitish coat is most often seen on the head or tails of the affected individuals. It is sometimes referred to as "bacterial fungus," and indeed Myxobacteria infections are often confused with fungus although they are caused by gram-positive bacteria. Here is some information about this affliction from my new book on seahorses (Complete Guide to the Greater Seahorses):

    [Open quote]

    Marine columnaris is a highly contagious disease caused by a Myxobacterium (Flexibacter sp.) that corresponds to the columnaris infections so commonly seen in freshwater fish (Basleer, 2000). The bacterium Flexibacter is a long, slender rod-shaped organism (0.5- 1.0 microns in diameter, and some 4-10 microns long) that is easily identified under the microscope by its characteristic gliding motion (Dixon, 1999). They are unusually mobile bacteria. They are very active when observed microscopically, gliding rapidly across the viewing field (Dixon, 1999). This family of bacteria (Cytophaga or Myxobacteria) causes a condition commonly known as columnaris because of their tendency to stack up in columns (Prescott, 2001b). When large numbers of the bacteria pile up, they form distinctive haystacks several layers thick where the infection is heaviest (Dixon, 1999).

    These bacteria are typically associated with stress, and columnaris is very often associated with a sudden rise in temperature. It is frequently seen in temperate seahorses suffering from heat stress or among tropical seahorses that have been subjected to a temperature spike during a summertime heat wave (Giwojna, Nov. 2003).

    This is primarily an epithelial disease that often presents as a grayish white film that spreads over the fish’s skin, particularly on the head region (Giwojna, Nov. 2003). The whitish plaques spread by radial expansion and may penetrate into deeper tissues, becoming yellow or orange due to masses of pigmented bacteria that stack up in columns forming the haystacks that are characteristic of the condition (Basleer, 2000).

    Columnaris is often described as a milky, slime-like film that can be observed with the naked eye (Giwojna, Nov. 2003). The bacteria are actually pale yellow, and the whitish skin lesions may become yellowish or even orange as the bacteria pile up (Prescott, 2001b). Depending on how many layers of Myxobacteria are stacked up in any given area, this gives the fish a patchy white to yellowish appearance (Giwojna, Nov. 2003). These bacteria produce enzymes that can dissolve the skin and decay the underlying musculature.

    Hobbyists most often refer to marine columnaris as White Patch Disease and it is often mistaken for a fungal infection (Giwojna, Nov. 2003). Although the head and eyes are most often infected, the slimy white patches can appear anywhere on the body and, in seahorses, the tail is also often affected.

    Columnaris infections vary greatly in virulence depending on the strain involved and the conditions that contribute to the disease (most notably water temperature), and the symptoms of the disease can vary accordingly (Giwojna, Nov. 2003). There is an acute form of the disease that may kill very quickly when the head is involved, often within 24 hours of the first symptoms.

    Less virulent forms of columnaris allow time for the symptoms to be recognized and treated. For example, milder strains may produce localized shallow ulcers where the white patches first appeared that respond very well to prompt treatment with the proper antibiotics (Giwojna, Nov. 2003). The gills are another common site of infection and are sometimes the only affected area. Respiratory distress may be the only symptom in such cases, and if the gills are examined, excessive amounts of mucous are to be expected (Giwojna, Nov. 2003). Damage to the gills from these bacteria is evident as brownish dead patches of tissue that are often attacked by secondary fungal infections (i.e., Saprolegnia; Prescott, 2001b). Cases of columnaris involving the gills typically respond favorably to nifurpirinol (Giwojna, Nov. 2003).

    Affected fish will become very listless and lethargic in the later stages, with reduced eye movement in seahorses (Giwojna, Nov. 2003). Reluctance to feed is very typical and the fish will often exhibit labored breathing due to the involvement of the gills (Prescott, 2001b).

    If caught early and treated promptly, antibacterial compounds are often effective, especially when accompanied by a decrease in water temperature. Some of the effective medications for treating columnaris include oxytetracycline (administered orally) and especially combination sulfa drugs that include trimethoprim or neomycin combined with various sulfa compounds (Giwojna, Nov. 2003).

    But the treatment of choice for marine columnaris infections is neomycin combined with nifurpirinol (Giwojna, Nov. 2003). Neomycin-nifurpirinol is a potent combination that works synergistically to great effect against this disease (Basleer, 2000).

    Columnaris is often associated with temperatures that are elevated beyond what is normal, or exposure to a sudden rise in temperature, and both the mortality and acuteness of the disease will increase at higher water temperatures (Giwojna, Nov. 2003). As with other bacterial infections, stress plays a critical role in the initiation of columnaris disease. Aside from heat stress, other risk factors for columnaris include physical injury, low dissolved oxygen levels, crowding, organic pollution, parasites, and high nitrite levels (Prescott, 2001b).

    At the first sign of White Patch Disease or Marine Columnaris, I recommend treating the affecting seahorse(s) immediately in a hospital tank using neomycin together with nifurpirinol (Giwojna, Nov. 2003). Drop the temperature in the hospital tank during the course of the treatments. Reducing the water temperature will slow the metabolism and reproductive rate of bacteria in general, making them easier to control, and the virulence of columnaris, in particular, is markedly reduced at lower temperatures (Giwojna, Nov. 2003).

    As with marine ulcer disease, there are a number of parasitic infections that can easily be mistaken for columnaris. Brooklynella, Costia and Uronema parasites all cause cloudiness or turbidity of the skin accompanied by heavy mucous production in their initial stages, which are similar to the white patches and filmy appearance of a columnaris infection (Giwojna, Nov. 2003). In their later stages, these parasitic infections result in respiratory distress and ulcers or open sores that are very like the symptoms of columnaris when the enzymes the bacteria produce erode away the skin and the gills are involved (Giwojna, Nov. 2003). Parasitic infections are often followed by secondary bacterial/fungal infections, and such parasites are one of the stressors that can result in a columnaris infection. This can make it difficult to determine whether you are dealing with columnaris, a parasite problem, or a mixed infection (Giwojna, Nov. 2003).

    For that reason, I recommend that you treat for parasites at the same time you are administering neomycin and nifurpirinol to combat columnaris. In other words, combine your antibiotic therapy with hyposalinity in the hospital tank (lower the specific gravity to 1.011), or with daily applications of merbromin, or medication with metronidazole, or all of the above, as explained for treating marine ulcer disease (Giwojna, Nov. 2003).

    Once it’s established in the aquarium, columnaris is highly communicable, as are parasitic infections, and it is very advisable to clean up and sterilize the main tank as best you can while the affected seahorses are undergoing treatment in the hospital ward (Giwojna, Nov. 2003). Combine a 25%-50% water change in your main tank with a thorough system cleaning as previously described (Giwojna, Nov. 2003). [End quote.]

    As you can see, Elina, you have done very well thus far with the first aid measures you have take. It was very wise if you to drop the temperature of the aquarium is to attempt treating the affected specimens with the medication containing nifurpirinol.

    In your case, however, because your seahorses have been battling this problem for some time now and all of the fuscus seem to be affected to one degree or another, I recommend you treat your H. fuscus with a combination of antibiotics, further reduce the water temperature to 68°F if possible, and administer a formalin baths (see instructions below) every other day for total of three treatments.

    The antibiotics I recommend for this are nifurpirinol (the active ingredient in Furanase) and neomycin sulfate, but these may be difficult for you to obtain in Germany. If so, then I suggest you try Neo3, which is available online from the following web site:

    Click here:

    Formalin baths used in conjunction with these antibiotics will help eliminate any ectoparasites or secondary fungal infections that may be involved. Formalin is basically a 37% solution of formaldehyde and water. It is a potent external fungicide, external protozoacide, and antiparasitic, and seahorse keepers commonly use formalin to cleanse new arrivals of ectoparasites during quarantine. Formalin (HCHO) is thus an effective medication for eradicating external parasites, treating fungal lesions, and reducing the swelling from such infections. As such, formalin baths combined with the antibiotics recommended above can be highly effective in treating White Patch Disease or Marine Columnaris when treatment is begun during the early stages.

    Many commercial formalin products are readily available to hobbyists, such as Kordon’s Formalin 3, Formalin-F sold by Natchez Animal Supply, and Paracide-F, sold by Argent Chemical Laboratories. Or whatever brand of formalin is available at your fish store should work fine, Elina.

    A formalin bath simply involves immersing the seahorse in a container of saltwater which contains the proper dosage of formalin for a period of 30-60 minutes before transferring it to your hospital tank. Include a hitching post of some sort in the container and follow these instructions: place the fish in a three-gallon bucket or a similar clean, inert container containing precisely one gallon of siphoned, aerated tank water. Medicate the bucket of water with with the appropriate amount of formalin for a concentrated bath according to the directions on the label. Place an airstone in the bucket and leave the fish in the bath for 30-60 minutes. If at any time the fish becomes listless, exhausted or loses its balance, immediately place the fish in clean, untreated water in your hospital tank.

    I want you to be aware of these precautions when administering the formalin bath:
    Formalin has limited shelf life and degrades to the highly toxic substance paraformaldehyde (identified as a white precipitate on the bottom of the solution); avoid using any formalin product which has such a precipitate at the bottom of the bottle.
    Formalin basically consumes oxygen so vigorous aeration must be provided during treatment.
    Time the bath closely and never exceed one hour of chemical exposure at this concentration.
    Observe the seahorse closely during the bath at all times, and it show signs of distress before the allotted time has elapsed, remove it from the treatment immediately.

    If you can obtain Formalin 3 from Kordon at your LFS, Elina, these are the instructions you should follow for your formalin dip:

    (a) To a clean, non-metallic container (i.e., a plastic bucket), add one or more gallons of fresh tap water treated with Kordon’s AmQuel . For marine fish use freshly prepared saltwater adjusted to the same specific gravity (or salinity) as in the original tank. Make sure the temperature in the container is identical to that in the aquarium
    (b) Add 1 teaspoons of Formalin·3. This produces a concentration of 100 ppm. formaldehyde.
    (c) Agitate the solution with an airstone and adjust for a moderately strong flow of air.
    (d) Remove the fishes to be treated and deposit them in the container for a treatment period of not more than 50 minutes. Immediately after the treatment period, or if signs of distress are noted, remove the fishes to a previously prepared recovery tank. The fishes may be returned to their original tank, but the presence of the original disease-causing agents in the tank water may result in a reoccurrence of the disease condition.
    (e) Observe recovering fishes. Make sure that tankmates do not molest them during recovery.
    (f) Repeat treatment as needed, every week. Each treatment is very stressful to the treated fishes. Do not reuse the dip solution.

    For additional information on treating fishes with Formalin 3 by Kordon, she the following web page:

    Click here: KPD-54 Formalin-3

    If you get another brand of formalin, just follow the instructions that it comes with for a concentrated bath or dip (not prolonged immersion or a long-term bath).

    Be sure to observe the following precautions when handling your seahorses for the formalin baths, Elina:

    Handling Seahorses

    I do not like to use an aquarium net to transfer or manipulate seahorses, since their delicate fins and snouts can become entangled in the netting all too easily. I much prefer to transfer the seahorses by hand. Simply wet your hand and fingers (to avoid removing any of the seahorse’s protective slime coat) and scoop the seahorses in your hand. Allow them to curl their tail around your fingers and carefully cup their bodies in your hand to support them while you lift them out of the water. When you gently immerse your hand in the destination tank, the seahorse will release its grip and swim away as though nothing out of the ordinary has happened.

    Composed of solid muscle and endowed with extraordinary skeletal support, the prehensile tail is amazingly strong. Indeed, large specimens have a grip like an anaconda, and when a 12-inch ingens or abdominalis wraps its tail around your hand and tightens its hold, its vise-like grip is powerful enough to leave you counting your fingers afterwards!

    In fact, it can be quite difficult to remove an attached seahorse from its holdfast without injuring it in the process. Never attempt to forcibly detach a seahorse from its hitching post! When it feels threatened, it’s instinct is to clamp down and hold on all the tighter. When you must dislodge a seahorse from its resting place for any reason, it’s best to use the tickle technique instead. Gently tickling the underside of the tail where it’s wrapped around the object will usually induce the seahorse to release its grip (Abbott, 2003). They don’t seem to like that at all, and will quickly let go to move away to another spot. Once they are swimming, they are easy to handle.

    Antibiotic therapy combined with daily formalin baths should be very effective in getting this problem under control, Elina. Hopefully, your seahorses’ appetites will return to normal once this infection is under control. If not, there are other measures we can take to get them eating again.

    Best of luck with your treatments, Elina!

    Pete Giwojna



    thank you Pete for your great (as always!) information which I read very carefully. I agree with you that the problem seems to be a mixed infection and, unfortunately, very virulent. I cannot understand where it came from because we have definately not had any heat spikes…

    We decided to consult the Munich University (they have a veterinary department for reptiles and fishes) and are working with them on this issue now. We lost another fuscus last night and brought him to the pathology to find out what the name of the game is. They gave us a broad spectrum antibiotika which we administer in the hospital tank (there are 6 fuscus which are treated) every second day after a water change of 70-80% for 8 days. On Monday we should get the results and know (hopefully) which parasites and/or bacteria are involved. I will let you know.

    We are starting a new tank for the Reidis (which are all healthy) and I am thinking of re-doing the Fuscus tank also.

    I am trying to understand why all the Fuscus got ill but the Reidis did not. I have bred Maine coon cats for a while and learned a lot about genetics. The Fuscus we have are from parents which are siblings – I do not know how long the inbreeding goes on already. Couldn’t immunsupression be a problem with inbred fishes/seahorses also?? Just wondering…

    Thank you for your help and have a great day.

    Warm regards,


    Hi again,

    well, we received the devastating news today: it is Protozoa (Ciliata) we are battling against. Then there are secondary infections caused by several bacteria. There are only three Fuscus left… two of them are eating. I cannot get Formalin here, the university advised us to try Freshwater baths, also for the Reidis, and continue with the antibiotika in the hospital tank.

    My question now is: how to clean up the main tank now where the Reidis are living?

    Thank you in advance.

    Warm regards,

    Pete Giwojna

    Dear Elina:

    I’m sorry to hear you lost more of your Hippocampus fuscus to this affliction, but that is a very positive development that the veterinary department at the University of Munich is willing to get involved. It is immensely helpful to have an accurate diagnosis to work from and hopefully we can use it to save your remaining fuscus and assure that your H. reidi remain healthy.

    Certainly when inbreeding resulting from brother/sister crosses allows undesirable recessive traits to be reinforced and weakens a strain of seahorses, disease resistance and the immune response are among the areas that are most often adversely affected. Inbreeding may well have been a factor as to why the fuscus were hit hard by this infection yet your reidi remain unaffected.

    If Munich University found ciliated protozoans during their necroscopic examination of your fuscus, then you are most likely dealing with Uronema, Elina. That’s a nasty bug that’s very difficult to eradicate from your system, but there are several different ways it can be treated effectively. Here’s some information on Uronema from my new book (Complete Guide to the Greater Seahorses) that discusses these parasites in greater detail, including the most useful treatment options:

    Uronema marinum

    Uronema marinum is the marine equivalent of the Tetrahymena pyriformis parasites that plague freshwater fish (Basleer, 2000). Uronematids are probably the most commonly encountered protozoan parasites of seahorses in the aquarium. They frequently plague wild-caught seahorses and store-bought fish in particular. Unfortunately, they are also one of the deadliest and difficult to eradicate marine parasites.

    They live in seawater and normally feed on bacteria and dead tissue, but they are opportunistic invaders that are always on the lookout for food, and are quick to take advantage of weakened fish (Kollman, 2003). It is when conditions favor them and their numbers get out of hand that Uronema becomes a problem. Under those circumstances, they soon begin to attack healthy tissue as well as dead material, invading the gills and muscles, eating red blood cells, and infiltrating the internal organs (Kollman, 2003).

    High temperatures and poor water quality are among the environmental factors that favor Uronema. Elevated water temps speed up their life cycle and accelerate the growth rate of Uronematids accordingly (Kollman, 2003).

    These ciliated parasites are very common on freshly imported wild fishes suffering from shipping stress (Basleer, 2000). Long-distance shipping is one of the factors that commonly contributes to Uronema problems. The deteriorating water quality in the shipping bags of fish transported for 24-48 hours is very conducive to their growth. Low pH, too much ammonia and organic waste, too little dissolved oxygen, and the presence of weakened fish with compromised immune systems all combine to create ideal conditions for these parasites (Basleer, 2000). They feed on damaged tissue, multiply quickly, and invade healthy tissue as their population explodes (Basleer, 2000).

    The initial symptoms are excess mucus production, heavy breathing, and loss of color (Basleer, 2000). As the disease progresses, pale patches or bloody sites appear, which become large ulcer-like wounds as the Uronema parasites multiply rapidly and invade the underlying muscle tissue in the advanced stages (Basleer, 2000). Infected fish often scratch these irritated areas. These open bloody lesions are often mistaken for bacterial infections (e.g., marine ulcer disease or "flesh-eating bacteria"), and the affected fish are doomed if antibiotic therapy is administered on the basis of such a misdiagnosis.

    These dreaded parasites also infect the gills, and as with Brooklynella, heavy gill infections may result in dead by suffocation before the characteristic skin lesions develop (Basleer, 2000). When skin lesion do appear, the open wounds invite secondary bacterial infections, which further complicate the clinical picture.

    Microscopic examination of skin smears can confirm the diagnosis of Uronema. Under the microscope, Uronema marinum parasites appear as pear-shaped, single-celled ciliates with a single large macronucleus and long hairlike cilia at the rear end (Kollman, 2003). Numerous small (35-50 microns), fast-moving, oval or pear-shaped parasites will appear on skin and fin smears (Basleer, 2000).

    Formalin, malachite green, or formaldehyde/malachite green combination drugs are effective treatments (Basleer, 2000). The treatment needs to be maintained for at least 21 days to cover the life cycle of the parasites. Chloroquine phosphate, quinine hydrochloride and quinacrine hydrochloride (antimalarial drugs) also work well but are difficult to obtain, difficult to use, and difficult to dispose of properly (Kollman, 2003).

    Freshwater baths, concentrated baths in methylene blue, and hypersaline baths at 45-50 ppt are also very helpful. Even 10-second dips in a 3% hydrogen peroxide solution are known to be effective. The peroxide dipping solution is prepared by taking one gallon of dechlorinated freshwater and then removing 10-oz of the water and replacing it with 10-oz of 35% hydrogen peroxide instead. This formula will produce a 3% solution of hydrogen peroxide for the brief dip (Kollman, 2003).

    There are mixed reports on the effectiveness of hyposalinity at eliminating Uronematids. Kollman highly recommends it, but the latest thinking on the subject indicates that hyposalinity is contradicted when treating Uronema (Kollman, 2003). For example, Thom Demas, the Senior Aquarist at the Tennessee Aquarium, finds that low salinity actually seems to encourage Uronema, whereas higher salinity thwarts it. He reports that raising the salinity of the system to 38-40 ppt while gradually lowering the temperature will greatly slow down the growth rate of Uronema and make it much easier to control (Demas, pers. com.). My latest experience treating Uronema with hyposalinity was decidedly negative and I also feel that hypersalinity produces better results for this parasite. It appears that Uronematids are unique among ectoparasites in their tolerance for hyposalinity, so treat accordingly. They cannot withstand freshwater, but hyposalinity seems to be quite another matter.

    With all these different treatment options for Uronema, one would think that these parasites would be fairly easy to control. Nothing could be further from the truth! Uronema is a very stubborn pest and terribly difficult to eradicate from your system once and for all. The problem is that formalin, malachite green, and the various dips and baths all do a fine job of killing the Uronema ectoparasites that are on the skin and gills of the fish, but they cannot touch the parasites that have penetrated within the fish’s body. The parasites that are attacking the muscle tissue, internal organs, and red blood cells aren’t touched by such methods and they are the ones that do the irreparable damage. What is needed is therefore a way to get the antiparasitics inside the affected fish where they can kill the ciliates that have invaded the tissue.

    Dr. Alistair Dove, the Aquatic Pathologist at the New York Aquarium, has found the solution. He reports that intramuscular injections of metronidazole at a dosage of 50mg/kg repeated every 72 hours for a total of 3 treatments work extremely well for eliminating Uronema in seahorses (Al Dove, pers. com.). The IM injections deliver the drug inside the seahorse’s body, precisely where it’s needed most. Of course, we humble hobbyists cannot manage such injections, but we sure can bioencapsulate metronidazole by gut-loading live shrimp with it and get the medication into our seahorses that way. That will allow us to attack the parasites from the inside and the outside at the same time.

    Because Uronema is so difficult to control, Basleer recommends treating it with a combination of treatments. He suggests treating the main tank with formalin/malachite green and then adding daily baths in freshwater and concentrated methylene blue for best results (Basleer, 2000).

    Lower the water temperature during the treatment period and stay on top of the water quality in your hospital tank. Make partial water changes as necessary to keep your aquarium parameters perfect. [End quote]

    It’s unfortunate that you are unable to get formalin in Germany, Elina, since that is the treatment of choice for Uronema. In your case, I would treat the remaining fuscus with malachite green in your hospital tank along with daily freshwater baths and brief dips in a concentrated solution of methylene blue or 3% hydrogen peroxide. Of course, continue the antibiotic therapy for those secondary infections (did the University culture the bacteria that was present and test their sensitivity to various antibiotics?). If the veterinary department at the University of Munich could possibly provide injections of metronidazole for the remaining fuscus, that would be extremely beneficial.

    Here in the United States, we would use formalin combined with copper sulfate to eliminate the Uronema from an infected aquarium. Since that’s not an option in your case, I would suggest that you sterilize the aquarium and everything in it with a good stiff dose of chlorine bleach (Clorox or any equivalent brand) instead.

    The appropriate dosage is 1-2 cups of chlorine bleach for every 50 gallons of water in the aquarium. Keep the filters running on the hospital tank while you treat it with the chlorine bleach so that they are thoroughly exposed to the chlorine as well. Be sure to sterilize any nets, dip tubes, hydrometers, basters or any other equipment that was used on the H. fuscus tank with chlorine as well. Give the chlorine about two days to sterilize everything in the aquarium, nets, accessories and all. After 48 hours, you can add chlorine neutralizer to your hospital tank to remove the bleach, change out all the water, and rinse everything very thoroughly with freshwater. And then you can safely set the tank up from scratch and cycle it again. Keep your fish room well-ventilated while you’re treating the aquarium with the chlorine bleach and be careful not to breathe in the chlorine fumes when you’re handling the bleach. When you’re done treating the fuscus, sterilize your hospital tank and everything in it the same way.

    Best of luck resolving this problem, Elina! Here’s hoping your remaining fuscus pull through and that your H. reidi remained healthy!

    Happy Trails!
    Pete Giwojna, Ocean Rider Tech Support

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