I have searched and seen many setups, I have 2 sizes to work with. I have 2 spare 20 gallon longs, and 1 spare 29 gallon. I am seriously considering using one of these spares to setup and care for a tomato frog.

Which size would be best or does it not matter given tomatoes aren't arboreal?
I know to use Eco Earth.
As for decor, I have seen several with cork bark and tall plants positioned in ways that would make them climbable/perchable by any arboreal frog...is this to provide shade only?
Also, lighting opinions?