Yeah the sapphire skimmer is kind of annoying to get it to skim, you need to watch the water level in the second chamber to make sure its just above the return. I set my pump to the middle setting, it seems to work the best for me, and the biggest problem I find with it is the airline, the majority of problems I have with it come from the airline. I was actually thinking of trying out the oceanic skimmer that is designed for the biocubes. hopefully something there helped you.
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