How do my plants look?

I just took them out of the solo cups Thursday. FFOF with 25% perlite mixed in. Northern lights under 600w mh on 18-6. How do they look?

Looking nice , happy growing!

They look good. How old?

Looking great bruh! The one looks like it might have nutrient problems though because it's affected the lowest leaves, maybe to much?

I started germinating the seeds 1-1-17 and have gave them no nutes yet. I have Fox Farms trio but am unsure when to start because I hear it is kinda hot. also when should I start trimming? This is my first grow, I'm sorry for all the questions but I am just trying to get all the knowledge that I can from this site and it is fll of more than I can comprehend. Thanks a million guys it is much appreciated.