Putting this in general as its more of I didn't know where to put this. I have a 40 gal long tank thats currently housing two smaller size Oranda Goldfish. Once we move the orandas are going in a 75 or 80 gal tank, and may go bigger so I can add two more goldfish (probably ranchus). This leaves the 40 gal empty, so what should I put in it? Id rather to get two fish for the tank then multiple small ones, its just the look I like. The tank is labeled 40 gallon breeder tank at Petsmart. I just want ideas so I can research the fish, would prefer a fully fresh water fish. So again I ask, what could I put in the tank?