Hello there, I am new at this site and I have seen alot of helpful information as I am also new in caring for fishes... I have a 50gal tank which I have had up and running for about 3 months now. I have 5 green/blue chromis in their and one fairly small selfin tang. Does anyone know if the chromis are know to attack each other? One of my chromis has blood coming out of one fin, do I remove him or leave him there?