leaves turning purple ?

i grow WW in 2 different enviroments and the ones grown under the lights well one plant has started with it leaves turning purple ??

the others in my vertical grow box are absolutly fine and producing on average 1oz dry a plant (not bad to say they grow to 1 foot in size)

whats the temp in the room?

A molybdenum deficiency will turn leaves purple. Does it look anything like mo def here?

https://www.rollitup.org/marijuana-plant-problems/216537-self-diagnose-your-plants.html

temps between 24c - 28c drop to 12c with lights out

its too cold when the lights are off you need to get a little heater on a timer so it will kick on when the lights go off

bobmaf said:

temps between 24c - 28c drop to 12c with lights out

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12°C? That's probably the reason. I've seen a couple of threads where people's plants started turning purple due to low temperatures.

My stems and leaves turned purple on ALL my vegging plants bc its cold where i am at now. and i dont have a heater on