I'm in exactly the same boat...I have 2 full grown G&G boys in a BIG terrarium, and quite a few months ago I brought some baby G&G's from Animates, so my little boys (or girls) are in a critter keeper until they are big enough that I feel safe putting them in with the Adults. I have been told by people who have kept them for a while that the safest time to put them in with another frog is when they're about 2/3's as big as the largest frogs.