Confusion

Hey again people! I have these two plants going in flower maybe 23 days since flip to 12/12 and they are showing this purpling on the edge of the leaves I haven’t found a lot on it. I feed with cana coco a+b nutrients and ph to 5.8-6.1. Temps in the tent are also between 70-80 in the day and can drop to 60ish at night or even colder. I’m not gonna lie sometimes the medium (coco) does dry a bit not completely dry which could be giving a deficiency. I have a problem with not watering often enough.
Thanks in advance.View attachment 4805256View attachment 4805259

Could be your cool night temps.
Could be genetics.
Doubt it’s nutrients. Looks too happy.

You should be feeding at least twice a day to substantial run off.