Hello. I have a 33gallon aquarium that currently contains 1 whites tree frog. I also have 2 more that are too small to live in there safely with the adult.

Thus before they get older or I get tempted to buy a 4th I feel I should probably ask... How many whites is it safe to raise in an aquarium this size? 3? or 4? (I think I may have mentioned this a few months ago in a different thread but I haven't been able to find it...)