flipped to 12/12 yesterday and although the girls look great was wondering if a 3ml/gal shot of cal-mag is a good idea or not.
in living soil under 2x ts3000 led
feeding gaia green 4-4-4 and 2-8-4
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If they look good, probably not necessary, but won’t hurt either.
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I agree with @Dexterado 
Probably not necessary if they looking good definitely should not hurt anything.
Infact, depending on the source of cal-mag you use, it possible has some N in it also and I like the idea of a little boost of “instantly available N” just after flip for the stretch
As they streach it can be alot of biomass built in a short time so imho, it want hurt but it “could” help 
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great, thanks guys.
i read about nute lockout and am scared to overdo it, this is my 1st grow that has went primo from day 1 and don’t want to screw it up.
PM, root rot, bud rot, thrips, you name it and i’ve had it.
thanks to help from you other forums i think i might have a clue now.
live,learn and don’t be afraid to ask for help for any other rookies that read this
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Or try epsom salt and nectar for the gods demeters destiny (liquid calcium)