However, realize that we add plenty of Carbon from CO2 that's fixed into active growing plant tissue.
That's fine if the plant tissue is healthy and growing well.
But bad if not, as bacteria will consume the tissue and give off lots of CO2 in the process as well as cellular contents that also leak out into the water.
Tom I was thinking on your post where you explain thet NO3 from fish waste plants can't use and algea can and thet from KNO3 plants can use N much better and why.Sorry for bad explanation what is interesting me.
Fish waste contains a lot of ammonia, not nitrate, and I think that was what Tom was discussing. Plants use both. Algae use the ammonia as a signal that conditions are good for growing, so the spores start "hatching".