I have a sump that is in essence, an algae scrubber, it sits in direct sun good part of the day, and all exposed media gets covered in algae.
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The algae has not migrated to the main tank, other than the normal kind of algal film that grows on the glass. I also take handfuls frequently from the sump to feed the cichlids.
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This algae scrubber of sorts has been in service since the tank started, and I have yet to get detectable nitrate reading using my API test kit. (still do frequent water changes though)
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