purple stems?

I'm not even sure if this is a problem but im kind of curious. Im 3 weeks or so into flowering and a lot of the stems on the bigger fan leaves are a reddish purple color. But my girl seems to be coming along fine so i would just like to know if this should be a concern.

how's the temps in there during day/night cycle? I heard low temps cause purple stems cuz of low P

temps during the day hangout around 80.night im not sure as i dont want to disturb my lady haha

Purple stems are normal on most strains that I've grown.

Well... I have always been informed it was nitrogen defficiency, but thats more of a light purple/red. I also have most of my plants show it, but I would add some nitrogen.

Try looking up your strain too see if purple stems are a characteristic. You don't wanna mess your plants up unnecessarily. I heard Formulex is good for secondary nute deficiencies like Mg etc.