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Overfert?
GrowingGrannieanswered grow question a year ago
This is a phosphorus deficiency .... and you need to take action quickly. Since you don't give information on the pH you're maintaining, I'm going to guess that this is the problem... a pH that's out of a good range... it should be between 6.0 and 6.5 for good absorption of all nutes.
You'll need to flush your plant (3x the pot volume of pH'd water) and then plan a course of better nutrition but most importantly, make absolutely certain the pH of EVERYTHING you give them is between 6.0 and 6.5. This will help guide you: https://www.growweedeasy.com/cannabis-plant-problems/phosphorus-deficiency
Good luck!
Ctrellis90answered grow question a year ago
You could be over feeding but it looks like you're burning them.
Your light may be too close.
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