yes, what brand & model of skimmer...lots of them are similar, but in many cases they are each adjusted in a different way.
If you can adjust the air intake, make sure you have enough air going in, but not so much that you have bubbles leaving the skimmer. Then you adjust the collection cup height so that you're getting dry foam coming out the top.
Not all skimmers have air intake adjustment...not all have collection cup adjustment (most do, but for example a Prism skimmer doesn't).
Also keep in mind it might take a week for the skimmer to 'break in' and skim at a consistent level.
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Former advisor and planted tank geek...life's moved on though.
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