yeah I think it is black ich. Freshwater dips should last no longer than 5 minutes but if your fish is acting stressed immediately put him back in the tank. I think hyposalinity might be an easier way to go but you have to drop the salinity slow as to not stress out the fish.
If you do the freshwater dips make sure you aerate the bucket as formalin takes the oxygen away. The book I have says the best is a formalin/malachite green solution with the bath. The dose rate they list is 15-25mg/L formalin (1.25-2 drops per gallon) combined with 0.05mg/L malachite green for at least three treatments, every other day. I hope that helps! let us know how it goes!
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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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