I got a purple alien og looking like that, I just gave it more light and and gave it silica and cal mag and it fixed itself but almost when it was 2 feet tall and 1 and a half feet all around, (scroging it)
SPray them with Neem Oil (for the spider mites) just in case,... check the soil, stick ur hand in it and check for mites. good luck amigo! =)
-Jugz