I really want to DO something with this TetraFauna Viquarium. It's kind of sitting here looking lonely because I bought it on sale on a whim. If I threw it in a 20 Tall and set it up all nice with a couple inches of water and a lot of branches/etc everwhere (and a trimmed Horsetail Reed plant in the actual water part) would three RETFs have enough space? My worry is the height, but conversely it also offers a pretty cool new environment for them. I was thinking if height is the issue, I could construct an aquarium topper (like the 10 gal ones for hamsters) and go up another foot or so. Thoughts? Is my spontaneous buy doomed to be forever alone?