Actually to be honest after reading that for and talking to you about building one, it has me thinking about finally building a design I've wanted to do for a while. 4 foot long mantel piece tank, about 6 to 8 inches wide and 6 to 8 inches tall that you could hang on the wall. I thought that would be so cool and us probably a sponge filter or something really small and run the return down to the opposite end so its like a small section taken of a stream. I'd probably stock it with just some small tetras or something that would go in a small tank like that, or maybe white clouds? Not sure but the more I think about it the more I want to do it!!