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Nitrate issues
Hi guys im going nuts i have a 220 oceanic reef tank been running 3 years , i have always have had nitrates at least 40 ppm .I do 50 gal water changes every 2 weeks tropic marin pro, i have 80 gal sump ae tech , skimmer ae tech ,75 gal refugium 6"sand bed in refugium,with a plenum under it. I have 1.5" sand in main tank with 400lbs live rock,my corals and fish are doing great even though its high ,I also use a 4 stage ro di unit with 0 tds . Any help would be great i would like to get them to 0 if possible.I only feed 2 times aday a little pinch for fish, corals 3 times a week. Thanks
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