Hey, same story here AquaAurora! I got three Evolve 4's on the Petsmart clearance, went ahead and modified two of them (drill holes in sump, block off overflow, cut holes in the output hose to loosen flow rate) and siliconed all around the bottom edge of the tank to dissuade leakage. But the filter is loud when it isn't suction cupped all the way at the bottom, which has proved impossible to do once I had taken it out to modify it. Overall just a disappointment. However since I went to all the work I am keeping the two and Craigslisting the 3rd tank for my money back. Live and learn, right?