Topped the plants above the 5th node.
Feeding twice per day with 200 ml per application at an EC of 1.1 and PH between 6.0-6.2.
All plants looking healthy and growing well. Gave first application of Miicrobial Mass.
I'm not sure if this is nutrient burn or a cal/mag issue (deficiency or lockout), or something else. Anybody know what is likely to be causing this, and how to treat it?
I don't think it's a cal mag problem. It could be due to using up the potassium. I would be tempted to leave your nutes as is but increase the bloom slightly and see how that goes.