4 clones three with spots one looks good

I took four clones. One looks great. I threw away one, because of this brown look. The other two have this same brown look to it. I thought maybe light burn, but they seem to stretch if the light isn’t close. They’ve already stretched way too much. Any ideas?

Are you feeding these yet? They’re from plants that were being fed I’m sure. Phosphorus deficiency.

They were fed and topped at three weeks in 1 gallon pot. transplanted a week after feeding 2/11, maybe I fed them late. I usually feed at week three and transplant in a month. Fox farms soil/cloth pots