Ich goes through cycles. If it looks like it has all gone then what it has done is dropped off to the substrate,rocks and corals and then comes back with a vengence. If you already have it out of the tank then treat it with hypo andbe done with it. Leave your main tank fishless for 6 weeks and all should be good. i would treat it if it is out already. Otherwise try and keep the diet good with garlic soaked foods if it is still in there.
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