Some of the substances that are skimmed out by the skimmer may be trapped by the filter sock so it could reduce skimmate production some. That is the reply I got when I asked this Q a while ago. I have run with and without filter socks and the difference for me was pretty small in terms of the amount of skimmate. But if it does reduce skimmate production a little bit it is still being removed from the tank when the socks are replaced. So, as long as the filter sock is replaced regularly they shouldnt be a problem. I change mine out atleast 2X per week.
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