I personally would not keep any treefrog in that tank. I have tried and with bad results. They like to jump long distances at night and can hurt themselves with the glass. Also, any small tree frog would be delicate and prefer not to be handled, so naturalistic bio-active tanks are better, since little maintainance will be required but the drainage layer and deeper substrate will take up too much available space in such a small tank. However, this tank size can work as temporary solution to raise juvenile tree frogs of most species since they will find it easier to find food. I would use a 20-gallon high as a minimum tank size and preferably something larger, such as a 18x18x24" tank