leaf problem

Hello It's looking like nitrogen to me too, a good way to tell can be if the leaves pull off easily, but you're still a bit early in the deficiency so that might not wholly apply. Id say to bump the samurai up to 2 ml, also when you water are you getting good runoff? For some reason with coco its been more important for me to get a good runoff versus with soil growing....maybe it helps keep the concentration up to a good rate where the bottom of the roots are. Hopefully with the increase to 1.2 ml it will get better but if not consider going a bit higher.👍