Great advice, friendly people, and lots of frogs!
Currently I have 2 RETF in my 12x12x18 exo terra terrarium but I'd like to fit in another if I can. I think 3 could still live comfortably but I just want to be sure
Zero, I'm afraid. The minimum is a 18x18x18" tank for one frog to a small group but even then, larger is recommended for activity and so you can create a stable bio-active set up and don't have to stress them with full cleanings. Juveniles can be raised in the tank you have, though
Okay thank you very much!