Thanks Loc Nar - I thought nute burn at first, but these plants are drinking up nutes like nobody's business! I use an EC meter, and yesterday adjusted it up to 1.2 - 24 hours later it was at .8! I forgot to add that these plants are in a basic NFT system, so I can't take one out...

...the frazzled skunk is the one closest to the pump...could that have anything to do with it maybe? like, it gets flooded with nutes before the others? doubt it, but....maybe?