Purple Under Leaves & Stem On Seedling?

Growing some Pineapple Chunk in DWC and i noticed underneath the leaves are purple as well as the stem. There not just turning purple but a bright shade of purple going up the whole stem and leaves, only about weeeks old and is sitting under a cfl until more true leaves come. Anyone know what this is and how to fix it?

I don't know if you're already using calmag but if not, that would probably fix it.

Would not worry about it.
I had the same thing and mine turned out fine. Give it time and it will turn green.