im having a similar problem with my bubblegum strain. i have attached a picture as to increase the odds of possibly identifying what the problem may be.....

they are growing in cocoand are receiving a aact once a week, nutes between along with plain filtered water.

just tested the ph runoff of a fresh water rinse: 7.06
ppm: 648
i feed heavy 16 bloom a and b and prime, humbolt's deuce deuce, ginormous, and honey.
the tea feed gets brewed with ancient earth by GH, molasses and sea kelp


any ideas brother?