im not sure about these but my thought would b that even if u could fit another it doesnt mean u have to. i was tempted to put another whites in my tank-even more (its a decent size and currently has 2 in there) but i figured id rather that the 2 frogs had more space. but either way its up to u. im guessin that the 1 frog=10 gallon rule applys with all frogs so maybe try workin out the tank size etc and do it that way