I am planning on putting a SW tank in my bedroom. The one I am looking at has a 10 gallon sump and the setup looks like it sucks in water from the tank, it runs down to the sump through PVC and spills into it where it is skimmed and then fed back to the tank where it flows out of a pvc pipe with holes in it. As it stood the water level was low in the sump and the water coming into it would just kinda lap out and splash. Is that normal or should the sump be filled all the way so it will run silently?