Any algae that grows fast and is harvested regularly will act as nutrient export... the key is the 'export' part. I would scrape some off regularly, collecting (and removing) the scraped algae... couldn't hurt. Sort of like an in-tank algae scrubber.
Having GHA in your overflow probably doesn't hurt anything if it isn't taking over your tank (or plugging the drain).
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Calvin
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Planning a 29 gallon mixed reef...
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