I'm using an AquaC Urchin Pro skimmer in my sump. Haven't had it for very long. It came with a Rio 1400. Over the last few weeks it has been skimming very little. The cup is all the way on the bottom and there's very little skimmate coming in. Any ideas why this might happen? I've cleaned the pump and the tube, but that hasn't yielded improved results. I'm thinking perhaps of replacing the pump altogether? Any recommendations? The skimmer is advertised as working with either a Rio 1400 or Mag Drive 3. Would the Mag Drive be better? Or something else?



