I have 5 in a 24 H x 36 wide exo . The use EVERY speck of space; including climbing ll the way to the screen. Mine are like little tree frogs!
I would go with a 24 high. Petsmart has them for 89.00 right now-good buy ! The glass needs to be pulled out of the screen lid and replace w/ 1/4 glass. It's an easy project.-but I cheat- I have the glass cu . It goes in very nicely with aquarium sealant. The back/lid has openings ( for cords etc) that can be left in the open for ventilation.I place a small battery operated fan in the front -facing the door vets ---for extra ventilation when needed.
Remember, once you add 5" of substrate - you have really affected the # of sq inches of leftover space. It all matters.
if you use the 12x12x18 ...........after substrate you have 12x12x13
if you use the 12x12x18 (which is 11 gallons )----after substrate it's now 8 gallons
Too small in my opinion.
They enjoy climbing:
http://www.frogforum.net/members/fly...2-24-2013.html
