eshopps hang on skimmer_ Help!!!!

[mws]

I turned of the skimmer to clean the cup and end up moving some liverock around. When I turn it back on it wouldn't stop overflowing and producing a lot of micro bubbles in a tank.
The handle to regulate the air flow doesn't make any difference.
It was working perfect for two months. And I normally turn it off once a day, when I feed the fish.

I and up taking it out and cleaning it(including the pump inside) in case of hair got socked in there. Didn't make any difference again.
Spend all day trying to fix the problem, I can't think what else to do.

If anyone have any suggestions please help.