High nitrate is not a cold. Changeing more then 33% at anytime is very bad. You remove benificial bacteria and cause the tank to cycle and it could be major cycle or mini cycle.
Did you always use unfiltered tap water with your FO tank and figured it would work with a reef tank?
How much LR is there?
Any SB and how much?
Do you know all the readings from ammonia to phosphate?
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Lance H.
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