After slowly aquiring all the pieces for my new 90g (about 6 months), I finally added water today. After swallowing about a gallon of salt water (trying to prime the overflow) I got it running...yeah for me!! Now for my problem....the water returning to the sump from the overflow is VERY loud. There is about a 3 inch drop from the end of the return PVC to the waiting water the sump...it sounds like a waterfall in my livingroom. Do I extend the return PVC so that the end is under the water in the sump? Any tricks out there?