Please help, 3 days ago my rams where having trouble swimming I thought they had swim bladder but by the time I got home with treatment one of the rams fins was shredded, I have done a water change and added fin rot treatment today but most of my fish are not very slow, my large and small plec are not normal at all, it's like they are all unable to move properly. My filter bust and was replaced 8 days ago, regular water changes with declorinator where done. Please can anybody help I don't want to lose all my fish, can the medication make them lethargic.