Terrafauna Viquarium meets Exo Terra Small/Tall

[AirQBert]

So I'm looking to put together a tank using a Terrafauna Viquarium insert (along with some thick plexiglass to span the gap) inside an ExoTerra Small/Tall (18x18x24).
Still in the planning phases with this, I was gonna go for some Gold Clouds in the water with some Fire Bellied Toads and Red Belly Newts and House Geckos and Anoles up top.
I've since realized that FBTs and RBNs are both TOXIC and I have no desire to poison the crap outta everything, so I thought I'd try some brainstorming with those more experienced than myself.
I already have the Gold Clouds in a small tank, but other than them, the tank, and the insert, nothing else is set in stone.
I've been toying with the idea of just doing the fish with a mystery snail and maybe a few albino dwarf frogs, and leaving the top level to a chameleon (after letting some foliage grow up in the tank and some fake vines to assist). Any ideas for some smaller chameleon that would thrive in a smaller tank like mine? Or does anyone have an idea for going in another direction?