Seedling leafs are turning purple

[lablue]

Hello… I successfully germinated 2 seeds that were given to me (not sure of the strain). I have noticed that the leaves on 1 of the plants are turning purple. I started the grow in a tent with 600w LED lights in my garage. No nutrients have been given. Wondering why this is happening. Any advice?

[beachglass]

could be genetics. they all grow different, even if same strain.
If you could fill this out, you will be hearing from many of the pros here.