How old are they? Greenleaf recommends increasing the MC1 every couple of weeks until the max of 6 grams per gallon from 8 weeks old til the end. They claim that the form of Nitrogen they use won't cause toxicity in flower, and it seems to hold true. I only held back on a couple of girls that seemed sensitive (disclaimer: i'm only on my 12th plant on MC1).Here's my coco grow with megacrop....they are beast now since I got it down....View attachment 1597229