So, my brother has a 20 gallon long, and he wants new fish. What could we stock the tank with that is warm water, and agree with the current fish we have in the tank. Here's the current stocking. 20 gallon 30x12x12 7 White Skirt Tetras (rehoming) 3 Kuhli Loach (rehoming) 1 Thicklip Gourami 1 Clown Pleco He wants something bright, and active, not small, nor too large. What are some suggestions? He wanted to try a betta, but I wasn't sure. He's also got some Bronze Cory on his list, that he must have.