I'm not an expert but I do know that the white coloured ones grow pretty big & will eat the fish you have described, the little brown African frogs won't grow nearly as big & they can live quite happily in a community tank. Mine needed a bit more of a specialist diet, I tried to keep it varied & it liked the frozen food from the aquarium shop...like worms, daphnia & shrimps. I also remember that you shouldn't have small stones in the aquarium because frogs are quite dim & will swallow them accidently...sand is better.