There is no nute lack that will cause the discoloration to purple in the foilage.

You plant is having problems regulating internal temps despite environments that are acceptable.

Your plant has the equivalent of a fever.

Burning up on the inside...but freezing to death on the outside.

The ONLY thing I would do is give a massive dose of SUPERTHRIVE...and some clear corn syrup...pH the water to 10.0

Then pray.

Good luck lil farmer.