Looks like they are coming along fine and I don't see any purpling. Only a tiny hint of light bleaching maybe but I've moved the light and plants into a new tent since I brought in 3 new mother plants to join the mother I pick out of these. Node spacing is 1 inch down to one half of an inch. I topped one, the others I'll wait to get another node and extend some so I can take a cutting and put it back down to the 3rd node.
To be clear these are 2 weeks from their first true leaves and 4 weeks from the point they popped above the soil.