Re:water circulation

#5414
Pete Giwojna
Guest

Dear Don:

Yes, sir, generally speaking, you do need to take special precautions when using powerheads or internal circulation pumps in a seahorse tank in order to assure that a curious seahorse does not get its tail injured or damaged by the impeller for the powerhead/pump. In general, this just means that whenever the intake for a powerhead pump is large enough to allow an unsuspecting seahorse to get its tail inside, it’s a good idea to shield or otherwise screen off the intake, regardless of how strong the suction may be, just to be on the safe side. Often this merely involves positioning the powerhead amidst the rockwork or anchoring it in place with the suction cup where there’s no possibility for a seahorse to perch on the powerhead or wrap its tail around the inflow/intake for the unit.

The Koralia powerheads are relatively safe compared to other types of powerheads. For one thing, since they are not impeller-operated, the intake or suction is fairly weak compared to a normal powerhead, and there is therefore no danger that a curious seahorse will have its tail injured by an impeller. Secondly, the "egg" or basket-like structure that covers the powerhead often offers sufficient protection so that an adult seahorse really cannot injure its tail. For example, the gaps in the Koralia 1 are only 1/8 of an inch wide, which is too small for grown seahorse’s tail to fit to the gaps.

Just to be on the safe side, some seahorse keepers will encase the entire egg for a Koralia powerhead in a veil-like material, especially if they have smaller ponies, as explained below:

<Open quote>
"I have a Koralia that works great in my anemone tankI have a Koralia that works great in my anemone tank(no seahorses). Just in case I bought a piece of Tulle (bridal veil material) to cover it. I got the purple tulle that looks just like coraline algae. Just cut it into a square and put it over the Koralia and secure the ends with a zip tie. Think of it like a lollipop wrapper-if the pump is the lollipop the tulle is the wrapper and instead of twisting the paper at the bottom like a lollipop you secure with a zip-tie. I have H. fuscus and H.barbouri and they could definetly hitch on the Koralia (and I have the nano) The pump still works great and nothing can get in it."
<Close quote>

The Tulle trick will work just as well for screening the intakes of other types of powerheads or circulation pumps as well, and the bridal veil material is not so fine that it will easily get clogged up or impede the flow through the device.

Also, Don, Koralias have a sort of "flow focuser" that you can snap on the front of the egg to help direct the flow. I would recommend keeping this collar on, since it will act as an additional barrier if a seahorse was to try and hitch to the very front of the egg. (Which seems improbable given the strength of the flow, but it’s better to be safe than sorry!)

However, with the full focuser in place, you will likely find that the water flow from a Koralia 1 is to overpowering for seahorses in a relatively small tank of say 30 gallons. If that’s the case, that would be better to leave the flow focuser off, since that will diffuse or moderate the water flow from the powerhead.

In general, if your seahorse setup is a relatively small aquarium, the Koralia nano powerheads will more than suffice.

Best of luck managing the water circulation in your seahorse setup to safely eliminate dead spots, Don.

Respectfully,
Pete Giwojna, Ocean Rider Tech Support


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