This is what I’m talking about. That’s the exact same issue that I had with my previous grow and the same issue I’m having now. exact. same. issue. And is always starts shortly after flowering starts. I’ve tried cutting the base nutrients, increasing base nutrients, cutting Cal/Mag, increasing Cal/Mag, adding a PK source and dimming my light. Right now, I’ve dimmed my light again, flushing my problem plant, and giving a weaker dose for a couple of days. I’m just sick of jumping back and forth through hoops to deal with a problem caused by a damn fertilizer line. This is why I asked if MC was as simple as it looked. I’m glad that I keep getting reinforcement from the good folks at AFN. Thank you to everyone who’s responded. I truly appreciate it.