Green trees would be good. Conditions sound like they'll be perfect. When you put the crix in for the frogs I'm sure your fish will enjoy an occasional cricket snack too.
Down here I've got tons of Cuban tree frogs, not as pretty as the greenies but a bit bigger. Very cool.
Down here I've got tons of Cuban tree frogs, not as pretty as the greenies but a bit bigger. Very cool.

Those look realy cool, are easy to keep and sould prosper in your setup. They are less likely to be eaten because they usualy live rigth behind the water surface and those long fins make them tricky to swallow. They are really exotic looking and there presence sould give the tank a jungly look
Dont forget to quarantine them first. good luck