Purple ? whats this from>

How old? and what are you feeding them? what's your ph? this will help a lot and I agree with noober doober. if ph off the plant won't absorb what it needs through the roots if ph is off.
 
i keep it around 7 but temp sounds right they were in the barn under 600 watt hps and its like -15 outside ao the light wernt enough heat
 
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