So it was that time again- I cleaned my back flow sump and took out my return pump to clean it. When I put it back, it started making loud vibrating noise and now I have silicone pads inside the return chamber to help make it quiet. But its not helping. Not sure what happened. Ive cleaned this pump out before and never had an issue till now. Its new as of last January and was quiet. Does anyone know how to fix this beside placing silicone and other sheets of objects inside my filtration to quiet the vibrating? Also will this new vibrating sound shock my fish and anemones?