I have two saltwater tanks, one 75 gallon which is 3 years old, and a 29 gallon which is 3 months old. The nitrates have spiked in both tanks. In each tank, I have done two water changes. when that didnt work, i cleaned the filter/sump. When that didnt work, I used water conditioner to lower the nitrates but the nitrates are still around 40 ppm
. In the past, they have always been 0 ppm
. I have my own RO
system. I have tested the RO
water and the Instant Ocean Salt Mix. Both are at 0 ppm
. Cant think of anything different I am doing beside my recent purchase of Marine Snow. Is it possible that it has any nitrates? Or would a better grade of carbon help? Any comments would be appreciated. Thanks.