defiecient

Can any help me with this. Left for 2 days came back to this ..seems somewhat isolated and only on one of my 2 plants. I see a few other leaves with the same discoloration but this one was by far the worst ?

hey guys, Bit of a noob and only in my second grow but have had great results thanks to this site. Have a question about my girl, she is starting to turn red/purple on some of the bigger fan leaves and starting to turn on the sugar leaves to. She seem to be and looks really healthy, I am about...