Okay, the FormaGreen is a little different than standard formalin. The FormaGreen is a combination of formalin and malachite green so the directions I’ve provided for you earlier no longer apply. I am not familiar with this particular product, but you should use it according to the directions on the label:
USE: external fungicide, external protozoacide, and ectoparasites, monogenia (i.e., trematodes), Hirudinea and crustacea (e.g., argulus). Helps to protect wounds from secondary infections. Can be used as a dip or for longer baths according to parts per million.
DOSAGE: for aquariums, use 2 drops per gallon. Treat one time and leave in the water for 5-7 days. Not for use with scaleless fish.
In this case, it may be beneficial to use the FormaGreen rather than the ordinary formalin, since the combination of formalin plus malachite green is even more effective in treating fungal problems. So if the thick heavy white band on the dorsal fin of your seahorse does indeed indicate fungal involvement, perhaps as a secondary infection, the FormaGreen should help resolve the problem.
As the instructions say, you dose the treatment tank only once and then leave the medication in the water for 5-7 days without making any water changes. In your hospital tank, if the water quality indicates that a water change is advisable, do a 100% water change (replace all the water in the hospital tank with fresh saltwater) and then re-dose the FormaGreen (two drops per gallon) and leave it in the water until the seahorse has been treated for a total of 5-7 days.
Just keep the Furan2 in a cool, dry place in case it is needed at another time.
Best of luck resolving this problem, Claire!
Post edited by: Pete Giwojna, at: 2009/06/20 23:16