My :twocents:

With RO water you loose micronutrients particularly Mg, and Ca. Cal/Mag is a great replacement or the ole Molasses routine.

But you should first repot those if at all possible. I think they are root bound, N overdose which is more because of nute imbalance/lockout with all the K you are giving them. So if it were my plants I would flush them and then repot.
WashougalWonder Reviewed by WashougalWonder on . Help, I think my girls are in trouble S= Grown:(:( in Soil E-indoor E-soil E-Fox Farms Ocean Forrest (with ~ 1/2" of perelite at bottom of pail) CSL-Fox Farms Ocean Forrest (with ~ 1/2" of perelite at bottom of pail) SCL- added a little perelite to the FF Ocean Forrest SCLR-3way meter (stick into soil) E-Reverst Osmosis E-~ 7.0 E-~4 weeks in flower Rating: 5