Yesterday I took the carbon, phosphate, and cotton(?) pads out of the wet/dry. They were full of detrius having been in there a month. I replaced only the white (cotton?) one to catch the detrius that got loose and was pumped back into the tank. Since then the skimmer hasn't produced a thing. I am going to run it a bit wetter tonight and see if that makes a difference. Before this it was producing a good tablespoon per day of some pretty goopy stuff.