Ok mate, thanks for your constant support lol, well it says on the bottle between 250-350ml per 100ltr and iv put 110ml (res is 40ltr) so about the minimum they reccomend. Its running 1.7 EC, think thats a bit high? Could always pull 5 ltrs out and replace with water to dilute? Cant believe i forgot A and B. its been in a week nowYeah id put it in, but don't over do it thinking you need to play catch up, you'll just cause nute burn and damage even more, give HALF the recommended dose that it says on the bottle, they'll be fine and bounce back, tough little things