Purple stems in veg, normal?

These are 2 Critical Kush clones in veg, the yellow leaves are from when it was in the cloner. New growth looks more or less healthy but I noticed a purple stem. My tent at night reaches a low of 58 degrees, where its at a max of 74 during the day. This is on the lowest setting for the inline fan. Are these normal genetic purple stems, or a sign of stress? Lots of conflicting information online, some saying 58 is a dangerous temperature and some saying you can reach temps of 50 degrees to get the purple color

Might be a deficiency?

If your in coco id say up the nutes.if not,warmer and add a little Epson.It will clear up as the plant grows.its normal or at least for me it is..
my room is cold also. drops to 64 at night.

normal for me as well they are purple then they turn green later on.

I wouldn't worry about it, I have them all the time

Magnesium or phosphorus deficiency. Probably P, right out of the cloner. Just use a complete veg nute. It'll clear up!

Fed them some veg+bloom yesterday and the yellowing of the bottom leaves went away for the most part, plants look healthy I just wanted to make sure thanks guys!
Really weird weather where I'm at, was 0 degrees two days ago now it's 55 and humid, it's messing with my intake air but what can you do.

Veg + bloom??
Please explain thx

over watered and Mag deficiency