I noticed you mentioned modding a skimmer. Could you offer any tips for this? I bought a no name skimmer and its not working properly, It had a small flow valve on the out put that i removed because water was just pouring over into the collection cup, this made no difference. How much does water level in the sump affect the performance of the skimmer? I am in the process of rebuilding my sump and am stuck on my skimmer issues. its driving me crazy. should i extend the height of the skimmer somehow? can the skimmer be raised out of the water and have a tube from the pump intake down to the water level? I know the answer is buy a new skimmer but my restriction is having only 17" of height to work with. thats with clearence to remove the collection cup. I havnt seen any skimmers that can handle 120 gal that fall into this catagory.