purpleleaf stem spreading to main stem

Hey what's up I have a few plants that the fan leaf stem is purple/redish and its allready spread to the main stem.I've never had this happen before.I'm not very good at recognizing deficiencys any help would be helpfull lol the phone cam isn't that great

cal mag, also a search forum deficiency

What strain is it?

I'm busy setting up my grow room so I didn't have time to search at the moment
It just stared really fast that's all but this grow I had to start from scratch but the room will be done today

Not sure of the strain

I would say depending on qhat media ur in could b a deficiency or the cold at night. Don't want to scare u but it could also b signs of bugs.. keep a eye open for any kind of flyers. Imma keep it real qith u and say when i first noticed i had root aphids that's exactly the way myplants looked.