Hello all, I got my CPDs today. However, one of them has some clamped fins and is skinny compared to the others. I had Melafix and Pimafix on hand, so after separating him from the school, I dosed both of those in a hospital 'tank' (which right now is just a small container with an airstone for lack of a proper QT system.) He eats, but only sparingly compared to the others, and does not nearly swim as strongly. No signs of external parasites like ich or velvet. Just the clamped fins, skinnyness, and relative weakness compared to the others. What is the best medication for handling an unknown disease like this? Something broad spectrum obviously, but any specific recommendations?