Normally I do about 4-5 gal water change per week. I've never had an issue with nitrates, always at 0. I would try and find the source of the nitrates and work from there. Even if I go 2 weeks without a water change I still have no detectable nitrates. I change my filter floss every 2-3 days too.
Are you using anything other then just the skimmer for filtration?
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