just FYI, those Prizm skimmers aren't that great to begin with. Don't be surprised you get significantly more skimmate in the cup with just about any other skimmer (save for skilters and possibly older seaclones).
If the tank isn't over stocked or stocked with messy carnivores, even a CPR bakpak with the maxijet pump would be a sufficient improvment over the prizm.
you can get a factory second CPR for around $100 from www.amekaaquatics.com
- it may have a scratch or bubble in the acrylic box, but still functions fine. but because it wasn't pretty enough, they won't sell them at normal price. its not a mechanical defect, just a cosmetic blemish.
since its a skimmer on the back of the tank...who cares?