Are purple stems normal for this strain? Not a lot...

Your plant is not suffering any deficiencies right now. Looking vigor . Red stem is genetic

Red stems are genetic traits most commonly found in sativa dominant strains. However it can be found in both. You shouldn’t judge your plants deficiencies or toxicity based solely off of your stems however. If you start to notice any deficiencies in your leaves then that would be cause for concern. Make sure that you are checking the tds of both the nutrient feeding you are adding as well as any runoff. Hope this helps. Good luck on your grow!

Red / purple stems have 3 main causes. Cold temperatures ( which does not seem to be the case here); phosphorous deficiency or magnesium deficiency or both. Feed 400 PPM of bloom ir PK and 200 PPM of mg like Epsom salts.

Unfortunately purple or red stems these days is mostly related to genetic expression. You need to be well trained in spotting deficiencies like phosphorus which can also cause red/purple/pink stems/petioles and many more symptoms. Your plant's aren't showing any deficiencies, from what I can tell, you should be fine man.

Hi there! If there are no other symptoms then this is probably strain related. However if you noticed a slow growth or fading leaves, then this might be a magnesium deficiency. In this scenario, adding some cal-mag or epsom salt will help, plants should recover in a couple of days and stems will be green again. Hope this helps, happy growing!