My mature Pearl Gourami has some fraying of his fins. Not a whole lot, but some. Once in a while, a fish will nip at his rear fins and make him jump. Also, my congo tetra has a split rear fin. Everyone else seems o.k. (It's a 55 gallon community tank) Should I treat for fin rot? I did recently have an albino cory and a rosey barb die (I couldn't tell of what though :sad) Should I treat the whole tank, and with what? My qt/sick tank isn't ready for fish yet. I have some coppersafe, maracyn-two tablets, and some Melafix Thanks everyone!