No relevance to this discussion?
This discussion is about assimilative ammonia and assimilative nitrate reduction and about the ammonia reduction rate which makes out the carrying capacity of each system. Nitrate by itself is not a concern at all in this discussion.
The carrying capacity and the calculation of the max bioload is explained in a publication of Spotte, S., 1979. Fish and invertebrate culture: water management in closed systems, 2d ed. ed. Wiley, New York. This is relevant lecture ! Basics for managing an aquarium.
How denitrifiers can install when there is no or little nitrate produced due to maintaining a high C:N ratio.?
Nitrate is a key factor for a healthy biofilm as it is used for recycling the biomass within any biofilm for oxidizing the produced HS.
http://www.baharini.eu/baharini/doku...of_the_biofilm
Assimilative heterotrophs grow on the surface of a biofilm and in the water column and will influence the biological balance all over the system as they are the main oxygen and building material consumers due to the very high growth rate. Carbon dosing effects all organisms directly or indirectly.
Carbon dosing will prevent the construction of balanced mixotrophe biofilms.
Live rock is a biofilter with a low capacity, certainly when high a C/N ratio is maintained as the pores will clog. Anyway, if a high C:N ratio is maintained the function of live rock and other biofilters is bypassed as no or little nitrate will be produced.