I am a very thrifty shopper, and I got this wonderful idea that could potentially save a lot of money. The one downside is the water circulation. You see, I want to get a kiddie pool, divide it into sections, and house tropical fish in it. The dividers would double as filters and I would put a heater in the middle. The dividers would be constructed of plastic canvas (like the kind many diy dividers use, if you know what I'm talking about) sandwiching: bio media/sponge and plants (the ones I plan on using aren't true aquatic plants and would sit just below the top of the divider with their roots going down into the water). However, there is nothing to force the water through the bio media/sponge to clean it. How could I fix this? What if I used an overhead sump? Or put a power head in somehow?