Hi Kairi, there's no reasons to be concerned. Leptopolis vermaculatus as you know are tree frogs, and now that they are in a vertical tank, they will more than anything be climbing through sticks and branches. I have one of them and I rarely see it on the substrate.

Foggers are great, but I would still advise that you mist once in awhile with dechlorinated water. Just for extra wetness. Also, do keep your bowl of water, and change it regularly. You still want to make sure your frogs have a place to hydrate.

Eric