My husband told me this evening that he feels like our new 125 gallon tank has taken over our living room. His main issue seems to be the sump. It makes a constant sound of running water. We lived on a boat for a number of years - to his ears, running water = something bad happening. I have two herbie overflows set up. These are silent. One of my returns vibrates (getting rebuilt this weekend), but that's not the problem. It's the sump itself. The sump is an Aqueon model 4. Both the water coming into the sock chamber and the water falling over the little wall to where the biomedia lives make quite audible gurgling noises. To me, it sounds like a fountain or something, but it's driving him nuts. Thoughts?