Randy Holmes-Farley
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The above tests are Aquaforest? Curious to see the Sulphur/moly/barium that off from setpoint.. I believe that limited amount of Sulphur would surely hinder anaerobic denitrification?
It's very strange if accurate, and I wouldn't use the mix if sulfate was that low.
The sulfur in question is present as sulfate. There is still a lot of sulfate available to convert into hydrogen sulfide if nitrate is depleted under anaerobic conditions (denitrification involving sulfate), but sulfate plays no particular role in denitrification reactions involving nitrate and organics, which is what more often happens in reef tanks.