Im probably in the minority, but I don't run skimmers on any of my tanks. Even on my frag tanks and DT's, I actually removed them over a year ago and the tanks have never looked better or had any problems. But I don't over feed and keep fewer fish.
If it's a fish only (fowlr) and 46g there really is no need for a skimmer as the water changes will be enough to keep the water quality in check. Don't overfeed and overstock the tank and you will have no problems. How are you setting up the tank, how much LR, LS?, fish list?