IMO if it's not broken then don't fix it, on the other hand if you feel your skimmer is not producing enough and your tank has a high load then you may want to upgrade. Your the person to ask this question to ideally, anyone can suggest that you upgrade your equipment but in the end your the one that will know if your skimmer is adequate or not. As for brand an model, ask on here and other boards what people with a 75gl are using, then you can make a better more informed decision as to which skimmer will work for your setup.
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