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You can lower nitrates by adding chaeto. Make small refugium - just place for chaeto with 6500K light and water flowing through.
Don't laugh, but I placed chaeto in $1 transparent soap holder on suction cups inside 10gal softies tank and placed narrow U-shaped desktop lamp with 13W 6500K bulb over it.
This not solved totally my problem with bryopsis, but reduced it drastically.
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