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I'm seeing something like this as I switch from tap to RO. I think my tap was locking out some things and when I switched to RO, it seemed to have unlocked those things all of a sudden. Now I think I was overfeeding (just didn't know it because of the water). I've pulled food back to 1/3 to 1/2 strength - depending on the plant and they're all responding positively. Perhaps I just have excessive nutes built up in the soil, but at the moment it seems to be a result of too much food from one source or another after the water switch. Reasonably finicky little buggers, aren't they?