I had a bad case of Ich on my large lion fish--the tang and squirrel eye in the same tank showed no signs. The lion had heavy hazing on his eyes--almost opaque--and lots of ich--I used 'Copper Power' (is just a fish tank) and within 4 days all signs of ich were gone and his eyes have cleared right up. He is eating well. I never live feed, but as he was getting a bit listlesss I did try feeder goldfish--- I have since been warned that feeder fish can often be the catalyst for ich--don't have any proof of that--was just advised to stick to frozen food. If you decide to medicate in the quarantine tank I would advise water changes in the main tank with as high salidity safe for the live rock and invertibrates to hopefully remove the ich parasite.
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