Re: PAcha's 400w 1ST soil grow closet 4 strains*4 LR2-4Blue Mystic-2 afaganXmazar-2ma
if your using RO, it wouldn't surprise me if you were lacking some cal or mag. Is it happeneing on older leaves first or newer ones? up on the crown or down by the bottom? . . . like i should talk with all of the nute problems I have, lol.
Have you checked your runoff pH lately? could be getting locked out if it's too acidic (pH<6.4)
If you are going to use tap, make sure you let it sit out open for 24 hours to get rid of the chlorine.
Try adding some lime to a spray bottle and foliar feeding that one plant with a weak solution, 1-2 teaspoon/gal. Since cal is immobile, a foliar spray will get it where the plant needs it fast.