Ok so I have a 92L tank and I have various fish in there, they're all communal fish such as neon tetras and Corydora. There's an old man who lives a few doors away and he had 4 convict cichlids, he came to me and said he will either flush them or give them to me so very very reluctantly I took them. I didn't have a seperate tank and thought I have to take them till I found a new owner for them. It didn't work out so I took all the tank decorations out and caught the convicts, after putting everything back and escorting the convicts to their new owner I noticed one of my very beloved black phantoms body is turning white which has never happened before and has happened all of a sudden. I don't know what to do and I can't find anything that gives me even any shred of help.