um dont they say at least 20 gallons for one treefrog then another 5-10 gallons for each one you add to tank. i think an 11 gallon would be way to small for a couple redeyes. maybe as babies thats ok. but for adults i dont think it would be good.

clown treefrogs are small
peacock tree frogs are small.

i would think you would want like a 20 high or 25 high and make it a nice planted aquarium for a treefrog