I bought a tank with sump off martketplace yesterday. I have a 90g with sump now and the output tube in my 90g has a stetchy pipe that goes into the filter sock which makes it not so loud since it can sit in the water. This sump does not have that and it's horribly loud since the water has like a 6inch drop. I don't know how to fix it. It's plumbed with pvc pipe. The bottom has a black ring hopefully someone knows what Im talking about lol. I have never plumbed an overflow so dont know the specific terms sorry!