Depends how much flow you're going for and how much your overflow can take. I would suggest one of the smaller sequence pumps, as I hear nothing but great reviews about them from reefers. I'm running a little giant, and while it works consistently, it's loud and vibrates the hood on top of my tank because of the frequency of the vibration. I've run a Mag9.5 for a skimmer too, and it was loud as well. Certainly not as loud as the LG, but loud regardless. The Sequence Dart and Eheim pumps are supposed to be quiet and reliable.