I keep my ranitomeya in 24x18x36" and 36x18x36" exo-terras. I have standards for frog enclosure size that goes against the common beliefs though. Most would suggest an 18x18x24" to be the minimum for ranitomeya. Larger dart frogs deserve more space. For tincs, phyllobates, and auratus/luecomelas, the suggestion is 36" length. 36"x18x24" gives you enough room to scape your viv and gives the frogs some height to climb. If you can go 36" tall for all your enclosures, your frogs will reward you and you'll be happier.