I'm going to switch from a 50 long to a 40 breeder soon and I wanted to set it up with either a 10 gallon or 20 long sump with a refugium. I know how to do everything in the sump I'm just not sure yet about how to build a good overflow box that won't make a lot of noise. I also don't want this to be a very noisy one. Any ideas? My return pump is a maxijet 400 or 600 can't remember or I was thinking of using my odyysea cfs 500 for the return.