I've been using one for years, first in the back of a biocube, currently it sits in my Aquaclear 110. The online reviews are pretty bad but I've always had success with mine. There is an airline modification you can look up so that the existing air hose extends further plus after that mod, you can add a check valve/air control valve at the end to help it skim even better.
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30 gallon cube causing me grey hair!
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