You better have a big bioload otherwise the skimmer will not skim and produce skimmate. I have that problem with the 30 gallons mantis tank and the skimmer skim only part time. Most of the time it is not skimming anything because there is nothing to skim.
On my other tank the skimmer pull out about one inch of dark coffe skimmate each day because it is full of coral and animals.
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More fish die from human stupidity than any other disease...
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