Hi, I am needing some advice I have a 220 litre tank with four fancy goldfish and one pictus catfish in it one of the goldfish unbeknownst to me had fin rot when it was introduced and I have been struggling with it for close to a month now have been treating with pimafix and melafix and the goldfish seem to slowly be getting better but now my pictus catfish is all red at the base of his fins and seems to be breathing hard and not his usual self is there anything I can do aside from continuing to treat the tank?