12 girls germinated 12-12-2020 Ali LED

It is a magnesium deficiency. So cal mag would be the answer. Unless your ph is off. I see on your diary your ph is not listed. I would start with what is your run off ph. If it's out of range plants can't absorb the nutrients. Causing deficiencies that you might not really have. Around a 6.2 6.3 is ideal. Also if you are using coco coir you will need calmag . Good luck and that should help a lot. Happy growing 🌲🌲🌲👊

Measure your pH, organic nutes are less stable than conventional nutes. Keep in mind that a bad pH will change which nutrients are available to the plant causing all sorts of problems. At the very least, get .1 test strip. They're cheap and last forever. Calmag tends to buildup in coco, so it's a good idea to skip it occasionally.