I'm considering the zoomed 18x18x18 and would construct a false bottom with a stream/waterfall running through it. Do you think that would suffice? Also Carlos, I notice you have an african bullfrog in your picture. I just recently got a little hatchling who is adorable and is growing SOOOO fast, I had no idea of their growth rate. Do you know what sex yours is? and/or when you would be able to tell. I hope mine is a male