Protein skimmer help

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Not familiar with that unit but I would guess that the tube in the cup your taking off in the picture is hollow right? If so you want the bubbles coming up that tube and overflowing into the removable cup
 
The foam is showing a lot right under the cup but isnt overflowing into it. Does it just take more time?ImageUploadedByAquarium Advice1390796784.359069.jpg
 
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