One of the stages if iChat is that falls off the fish giving the appearance of a cur but it comes back with. Vengeance.
If you gave no qt get some garlic extreme from a Lfs or garlic extract from a health food store and soak nori in it and feed. Feed very often and only garlic soaked food.
Yap I am doing that All the nori that's going in gets soaked in garlic guard for a min or two.
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You wouldn't want to see my tank. I don't use fancy equipment and I am a noob