Has any body out there made there own protein skimmer with some plastic tubing, some old cups, air stones and a small pump? I have a old gravel vac laying around that would make a great intro chamber and then could make my own venturi with some smaller plastic tubing and a plastic cup for a collection chamber. I could hook up a power head to the main chamber to help with more water flow. Get a air pump and a super fine air stone, place it inside the main champer and watch i bubble away. Has anybody done this? Has anybody made their own protein skimmer any other way for cheap? I'm looking for something rated for at least 30 gallons.