Got my new tank filled and running to check for leaks. Can changing the size of the hole on top of the cap change how much air is dumped in to the sump with the water? just about all the noise i am getting is from the air falling with the water in to the sump. the drain is 6 to 8" deep in the sump, and it seems the tank surges as well. my other thought is my pump is moveing the water too fast. Can i put a valve in the pump return to slow the water?