I have two WTF setups that are 20"x20"x36". One has about 3 inches of soil on a false bottom with a waterfall unit(http://store.yahoo.com/pet-guys/-097612910200.html) and the other has about 4 inches of water and the 'viquarium' (http://members.tripod.com/~Draybar/5527.jpg). These pix are not my tanks, but will help you see how my tanks work. There are appropriate rocks, plants, logs for the frogs. Is there a way to use the viquarium and not have it be a pure water tank by sealing off the pump from the soil and then seal off the front of the 'viqaurium'-the part where the river ends-from the soil? I like the looks of both tanks, but want to make them half water and half real soil, not just wet gravel as the viquarium requires if you have 1/2 soil and 1/2 water. I can send you pix of my tanks if it would help.