Deficiency or leaves turning red/purple due to flowering?

I would of said natural draw for the flowers.They will use extra pk during the first 2wks of flower and again 3wks before harvest.A bit of shite and ash works wonders.Guanokalong sell bat shite as a taste improver.

Calcium deficiency. The advice that you do not need to pH organic nutrients is 100% incorrect............of course you should pH adjust nutrients and/or soil,, organic or mineral.

Good practice to never add anything to your medium when there is a problem until you can rule out its not a pH drift. A 70% relative humidity (RH) at 62°F translates to a relatively low Vapor Pressure Deficit (VPD) for most plants, meaning the air is quite saturated with moisture and plants may not transpire as readily; this could be considered suitable for young seedlings or plants in the early vegetative stage but might be too high for late veg/flower depending on the specific strain and growing conditions. What I see is a plant that's gas exchange is crippled. Water doesn't leave, new water doesn't go up. New water doesn't go up, nutrients don't go up. If nutrients don't go up they stay in the medium until salt content gets too high and pH drifts, precipitating many micronutrients that become unavailable to plants. A high calcium ratio usually causes high pH and can muddle with Mg absorption which may be what we see in the picture, combo mix. Good luck.

Okay. I'm looking at your diary You shouldn't HAVE any issue with those nutrients "Green buzz" Then I seen. Ph powder. Mate. You DON'T ph organic nutrients. Stop using that PH buffer and the issue will fix itself. You can add pure epsom salt (150ppm added to tap) just add it I. Your mix the ph will adjust itself. Stop trying to adjust a ph that's not needed. That's the only thing I can see. Also. Don't let your soil dry up too much using these nutrients. They must be moist