scum

Question for ya'll - I installed a Reef Octopus s-130 protein skimmer about two weeks ago. My sump water level is at the high end of the recommended range, but still within it. I was told that bubbling over as it broke in was normal, but it's now been long enough that I can see it's skimming...

So - a recent thread reminded me of a question - how often do people clean their skimmer neck/cup. I do not do it regularly - and it tends to have a thick coating of 'gunk'. I always wondered if that was putting bad stuff 'back' into the tank - though I dont think it does. Answer the poll -...