What I did is PETCO has power head aquarium pumps that can be used with in tank submerged for just circulation or externally and I plumbed it into my drainwith hose and hose barbs. In the terrarium I have a mesh bag of ceramic tubes used for Bio filtering in those canisters and buried it under the gravel. Essentially making my terrarium the canister filter, more or less.

I went through a couple head aches with my full height water feature but have the kinks worked out. Water used to soak the entire wall and drown my plants on the wall. A silicone sculpting job fixed that. Then the water that would free fall spattered and splashed everything, a couple rocks on either end of a string gave the water something to follow and broke the pond surface almost eliminating the splash.

Since my girlfriend is deciding to make this a Noah's Ark of RETF morphs with at least 2 of each, it will soon be crowded and so I'm starting to build a bigger one. Once that one is complete, I will be looking to sell this one.

Let me know if you're interested.