Need a lil help leaves curling upward and purple stems.

Ok the baby is a month old. It was a left over seed from a previous grow, so i'm not certain of strain. She is in a 2'x2'x4' tent, with a hydro-grow 84 X2 led light. Temp is around 80°, not sure of humidity. I just put a damp towel in. Growing in soil ph is 7, tested soil everything is right on. Had a bit of nute burn previously but clearing up.I'll include some pics. Any help is welcomed.

how did you determine the soil was a 7.0?

7 is high for ph. What is the water going in? Curled leaves and purple stems usually means you need some cal-mag.

Ph pen. And i'm thinking its a Mg defiency also. Tryin to add a couple pics WTF. I did a NPK test and everything was good so i dont want to add nutes right now. How the hell do you add pics.