James Ervin wrote:
Makes perfect sence......now it fits. Nitrate is a marker for a need
to change water for the more potent DOCs.

No it isn't! Planted tanks will generally have little or no nitrate (if none
is added). Does that mean there is no DOC accumulation? Absolutely not!

--
Victor M. Martinez

http://www.che.utexas.edu/~martiv