This thing is a lot more trouble then its worth. With all the adjustments, im about ready to dry it and bring it back to the store. I'm so sick of it by now. Im getting bubbles circulating on the top of the water and then TONS of micro bubbles in the water. Im about ready to just get one of those skimmers the others suggested, if I can find the right forum I posted in. But I am definitely looking to get rid of this skimmer. It really has screwed everything up.