you could probably get away with a 12x12 for a little bit, but they will definitely make use of a larger enclosure asap. i have my 3 babies in a screen cage with plexi front and it works nice because at night when i throw in crickets or roaches and the food climbs the walls the waxies can climb the screen walls also and go after them.

they can sometimes be very active at night and the more room and thin branches and surfaces you can provide i think the better. mine also now hang out in the plant i put in there all day. kind of a bummer because theyre less in view but i guess if it makes them happy.

i'll second the notion that you pick up another one or two if you can. they are definitely social frogs and its really funny watching then climb all over each other when hunting etc. they usually bask close to each other.

these are very cool and unique frogs though, you will have a good time with them. good luck