Jef79answered grow question 5 years ago Hello.. Hope you are well.. If u got 16 plants and u feeding all same n only apearing on her atm i wudnt worry to much n its probably she just the weaker 1 in the room.. How high are ur ec/ppm levels.. Give her a watering of plain ph'd water at nxt feed to see if u can dislodge any salt build up in pots.. This mite help her.. Stay safe n gud luck 👍🍀