i had three of these, which i modified into 1 - by taking the bottom off two of them and stacking them, with pumps into the top two inlets, and the lowest one blocked. it was still s**t, but better than nothing i guess. if you are going to use it, get the gruntiest pump you can for it. i was using a via aqua 2600 and a 4900 on my modified one, and it [wet] skimmed a little bit.