okay guys, here is another plumbing question since hubby is still out of the country. Our protein skimmer does not seem to be working. It is a custom built one that we bought. the problem is the water level only seems to get high enoupgh to go into the second chamber. There are bubbles but I din't see how they would get high enoupgh to get into the 3rd chamber to be expelled. I don't know if we just need to invest in a new skimmer all together or what but at this point I don't think it is doing anything!