please help with these 3 plants they look sick!

Indeed. It is a magnesium def and it's loo late to fix it. I'd suggest you get a calcium/magnesium supplement for your next crop.
 
Daaaaamn.....weellll I went ahead gave them plain water...I hope this doesn't ruin them....I have Sensi cal grow n bloom. I've been doing 20ml per 5gallons...so safe to say I wasn't using enough
 
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