I have a 25 gallon tank that currently has 8 cherry barbs and 4 platies. It also has an angel fish and a bristle nose pleco that was in my 75 gallon tank before it crashed. They will be relocated to a new 75 gallon tank when it is set up soon. The dimensions of this tank are 24x12x18 LxWxH. I would like to add just one centerpiece fish to the tank to finish off the stock, after the angel fish and bristle nose pleco are moved.