Have you left your lights on over 12 hours? This usually causes purplish leaves.

Yes I've had then on 15 most days should I cut back to 12?

I usually stick to 12 on 12 off when starting seedlings indoors, but after that I harden them off and send them outdoors. More than 12 usually the plants develop the purple leaves like what you have. Cut back and the new growth should be fine.

Is it the 3 part gh. Did you mix the micro first? Did you use tap or ro water? I would not cut off any growth yet the plant is to small. I dont think the light time matters. I keep my leds 18" from the surface. To close with leds and you dont get the full spectrum. I would dump the nutes and just run the grow at the recomended dose of 5ml per gallon. No micro or bloom. Once the plant is thriving you can go to the full 3 part. Check your ph it should be 5.5 to 6. I run 5.8. Here is a pic of my reaper in soil under led since it sprouted april 1st. Just took the pic.

I dumped my nutes and pulled my light back some thanks for the advice. Impressive plant btw