The water level for your aquaclear would have to be way to high for it to function (unless you extend the tube) as a waterfall, not to mention you'd have a huge gap to cover where the water flows inside. I use and recommend internal filters inside of eggcrate "houses." I use the cheap walmart ones for like $10. I cover the hole where the water comes out with fiberglass window screen $5, but you could easily use needlepoint canvass
$.50.
Tree frogs are aboreal, so I would consider inverting the tank to give them more climbing room. Silicone (or hot glue) some branches into the tank for them to climb on. Tree frogs don't care about any water features, but if you use one, make sure they have plenty of ways out of the water.
Good luck scott...
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