Well again last night I got a cup full of water. So I took the skimmer out and just rinsed it under warm water. It felt slimey of course before I rinsed it, but after I was done the plastic felt very clean. So I put it back in the tank and started it up without adjusting the air flow rate. I noticed right away that my bubble height wasn't nearly as high as it was before rinsing. So I cranked up the air and got the bubbles 3/4 of the way up the collection cup tube, I couldn't get them any higher.
I checked it this morning and I only have a small ammount of water now, but I am getting more foam forming. So I think rinsing it off helped.
For anyone else who owns this skimmer, how do you go about changing the airstone every month as recommended? I tried to get the stone out of mine last night and of course it sweled due to the water and won't fit through the top hole. I didn't try pulling of the black collar on the top, does it even come off??