a lot of plants.... care to elaborate?

i am worried about my bubblegum plant. i have attached those pics to increase the odds of possibly identifying what the problem may be..... i might be a sulfur deficiency!?
water every other day with RO water
they are growing in coco and 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
and ppm was: 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