A few weeks ago I decided to through a small desk tank together. So I found a 5gallon tank I had bought my kids a few years ago and made it rimless. I painted the back glass black. So black sand small led light. And a small CPR hang on refugium as a filter. The. On to the nice coral and my cleaner shrimp as the center piece of the tank. Anyone else building Pico tanks. 5 gallon display 2.5 gallon filter water perfect