My god, what a difference. Today I built a Durso Standpipe to replace the factory standpipe that came with my Marineland RR 65g. No more gurgling! I also built it about a 1/2" taller to reduce the waterfall sound of the overflow. Between swapping out my Mag 7 pump for a Jebao DC-3000 yesterday and the new Durso, my tank is now literally silent. The only thing I hear now is the fans from my old metal halide fixture. When my new LED fixture gets here that should be gone as well. If anyone has been thinking about building a Durso, I highly recommend it. Total game changer.