Hey there! I ended up going with a 1.5" layer (approximately more like 2") of the Hydroballs below the substrate. Turns out that waterfall leaking was the culprit because not more than half a day later, there is a visible inch of standing water in the substrate layer. So that sucks, but the plan is work up a new build eventually with a false bottom that allows the waterfall to be completely under water, so that it won't mater if leaks.
On a happy note, as you may be able to see, I dramatically changed the entire tank also. Think it is more tree frog appropriate now. My dad bet me 5 bucks that despite looking cool, the frogs would never use that hanging vine. 10 minutes later, five bucks more in the wallet. Thanks for all the help everyone!
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