Thank you for your input. The micro mini is really small, like I said, his/her body is the length of a thumb nail. and the largest one's body is about 1 1/2 in, with a another smaller frog in there as well, about 1 inch in length. I do want to keep the teeny one, and like I said right now it's in a separate and small enclosure, with some eco earth, a small dish of water, some plants to hide, and some moss, and the enclosure seems to be decent enough in size, when you take into consideration how small she/he is. Anybody know how long it may take for this little froggy to be an appropriate size to introduce into the tank with her/his "siblings"? I think the largest is pretty close to full grown...