having autoflower grow issues please help

I'm new to growing I just recently got my.card for medicinal growing. And as a test run I'm growing one diesel Ryder and I have noticed a bit of purple on the stem and under the leaves just curious if anyone has any tips on what they see I can do ?

i dont really see a problem i see a couple of burnt tips maybe last feed was a little hot . some strains have purple stems most afghani leaning plants do . never done an auto i dont think but you look good . good luck .

Thanks I hope everyone is right