Hi I have a Tunze 9004 dc skimmer running on my 45 Gallon since last 25 days plus however I never see any brown gunk collection in cup , it's mostly water .
Is my skimmer defective ?
You tune it by the pump speed on the controller. For reference 50% power is equal to an AC model with air completely open so you will need a speed between 20-50%.
There are two foams in a skimmer, air and water that you don't want in the cup, and the thicker protein foam that forms on the top and that is what should go in the cup. If it skims water, you must turn it down.
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