Yup..............the unknown is what screws any logical attempt at correction. If you tried to increase the microbial activity, that
could cause the breakdown of the "Timed released"
stuff that's causing the problem.
I still didn't get how many days into the grow. If they are fairly close, I'd just try a huge dose of
LITFA, keep the vpd to the lower end of the vpd range and run it out. I'd rather do that than chase my ass all over and. waste $.
edit...................Pretty funny me saying
LITFA!