black ich is different from regular ich because it's a worm parasite. They are planarian flatworms that attach themselves to the skin and gill tissue which would be why the one gill isn't working well.
According to "The Marine Fish Health & Feeding Handbook" by Goemans and Ichinotsubo, the best treatment is formalin/malachite green freshwater baths and placing the fish in a hyposalinity hospital tank can be helpful too. It says you can also mix praziquantel (Droncit dewormer) in directly with food for the fish.
So I guess the best way would be to put the fish in hypo and treat with formalin/malachite green.
I hope he pulls through and hopefully is still eating!
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equipment: Eshopps psk-200 skimmer, Mag 12 pump, 30gal sump, 2x 300w Finnex heaters, glass-holes 1500gph overflow kit with 3/4" return kits, 72" 8x36w t-5 AquaticLife light, 66lbs of LR, 150lbs of tropic eden reeflakes, 2 Koralia Evo 1400, JBJ ATO, BRS dual GFO/carbon reactors, Hydor smartwave
Current Tank Info: 125gallon
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