I just bought a CPR Back Pak 2 protein skimmer from a friend for my 40gal fish only saltwater tank. It's in my tv room and I can't handle the noise it makes. It seems to be working fine and my friend said it's normal for that type of skimmer to make noise. Can I do anything to make it more quiet? Most of the noise seems to be coming from the Rio pump this skimmer came with. Could I maybe buy a different pump that makes less noise that would be compatible with this skimmer? 