Nix the bluegill at least three other Lepomis species would be better. As far as color can't go wrong with the dollar or longear. Longear would be in your area along with my favorite the green sunfish. The green sunfish is a great fish. Eats about anything and water quality isn't much of an issue with this fish. The coloring is also pretty although not as striking as the other two mentioned. All of the lepomis species are aggressive and will kill about every smaller fish or same size fish in the tank. Longears are about the worst from my experience, even managing to kill slightly larger fish in the tank. Very territorial like the other members.