I have made some references to a friend of mine who had a few different frogs in a tank. This included some White's and a golden treefrog. There was no aggression towards each other, and it seemed as if there are no problems for a while. However, she did have one get red-leg, and she had to isolate it. Then a few months later, one of her frogs died. I didn't think anything of it until hearing all the good advice on here saying not to mix frogs.