I have used a mag 7, mag 9.5, then finally eheim 1262. I did see significant improvement with the eheim, but the skimmer just needed too much attention for my taste. My octopus skimmer just seems to skim and skim and is not that sensitive to feedings/hands in water. I think my biggest complaint was that the skimmer performance was reduced when the smallest bit of salt creep found its way into the air injector.
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