Going to dose NO3 because I still have it undetectable.
BTW my poly filter that I put in the sump didn't change a color.
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My build (75 gal DT with 55 gal sump/refugium):
http://reefcentral.com/forums/showthread.php?t=2442383
Current Tank Info: 75 gal with 55 gal sump/refugium
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