Is it even producing bubbles in the main chamber? This has happened to me a few times and I just took the skimmer apart, rinsed it, and it seemed to work well.
Also, the pump should be as close to the surface as possible. Try using something to prop it up and connect it with a shorter hose.
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~Drew
10G Nano * 10G Sump * Deltec MCE 600 Skimmer * JBL Viper 150w MH * Zeovit * Vortech MP40W
Millions long for immortality who do not know what to do with themselves on a rainy Sunday afternoon. ~S. Ertz
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