Here is a two part question.I have a 125 gal tank one of my first fish was i bought 3 years ago was angelicus catfish about 2 inches .over the last 3 years have added red parrot ,tin foils ,green severm,electri blue demsey,jupari,2 irrdestant sharks,geo brazilius,last night angelicus cat face was cottoney looking,plus wiskers look bitten off.i don't want to flush him ,but if its sick don' t want to get other fish sick,don't know if it was attacked by other fish ,by the way most of the fish 5to 7 inches..swimming near top now ,which it never did.Do 40percent water changes weekly no amonn,ph 7.0 need advice thank you