Not to argue, or to sound like I think I'm an expert, but everybody knows where nitrates come from - the end of the nitrification process (assuming RODI
water and good food sources).
Not everybody is lucky (or wealthy) enough to have the right combination of rock and DSB
to eliminate all the NO3
produced, especially in the cases of heavy bioloads, and some is left over, and the residual builds up over time.
Any cycled tank is going to have nitrates, its a matter of them being processed immediately or not by natural filtration, and whether or not they're present in any measurable quantities. NO3
doesn't magically *not* occur at the tail of the biological filtration cycle because you do regular water changes.
I'm quite aware with where the nitrates are coming from. I use RO
water. I rinse frozen food, and I use dried food and salt that don't contain nitrates. That leaves the biological/nitrification process, which everybody knows creates NO3
as its end result. Its either entirely removed by LR
(or denitrators), or it builds up. I haven't had enough LR
in the past to process the NO3
out of the tank in the form of nitrogen gas.
I was just wondering if anyone had seen a reduction in NO3
from the prescence of cyanobacteria, which feeds off NO3