I have a friend with a 55g w/ a 7in. water turtle(unknown species) and four 4in. feeder fish. I want to get rid of three and keep one but I don't know if they are schooling fish. I don't want to stress the one out or make it lonely. I need some help with this cause they all(including the turtle)make the tank really dirty. :help: :thud: :help: :thud: