Every fish has ich dormant inside of it. When the fish gets really stressed its immune system drops and the ich parasite grows and shows up on the fish. Just keep it in the quarantine tank until the ich starts to fade. Feed the quarantine tank small amounts of food 3 times a day to keep the fish healthy. Keep water changes often and the ich will die off as the fishes immune system recovers. I also had a blue tang that got ich, it dissapeared after a month of feeding garlic soaked fresh plankton. I also noticed if I missed a day of feeding the ich returned so the food is really important for the healing proces.
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-Lisa-
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