Nitrite is taking 2+ days after appearing** not after adding ammonia, should have clarified that. I recognize it’s also slower in general than the first bacteria in the process, but not usually this slow. I’m less so worried about potential toxicity than I am about there just being some strange unknown problems that are causing this. I’ve never run into this problem before and wanted to see if anyone had some explanation.The reason is very simple, the bacterial additives we use contain several strains of bacteria, those that consume ammonia, those that consume nitrites, and then nitrates. The ammonia consuming bacteria bloom first, as ammonia is the first food available, then subsequently the nitrite consuming bacteria, and then nitrate. This is why nitrite takes longer.