PLANT HELP PLEASE.

I have a auto that is 6 weeks old today. I have her in a 3 gallon smart pot with happy frog soil. I just started feeding flower nutes last week at 1/4 strength of GH nutes. I fed again last night and today I see this on the top leafs. Can someone maybe tell me what this is and how to fix it?

Looking like iron deficiency to me.
http://www.growweedeasy.com/iron-deficiency-cannabis
That link will help you figure it out. That website has all kind of good info

I don't remember how I found this, i'm sure it was through RIU somehow. Check out the sick plants link first, scroll down a ways till you see all the pictures of the sick plants. That should help you out a bit .

101 already asked questions (some broken links)
https://www.rollitup.org/t/101-already-asked-questions.1326/

The complete guide to sick plants, pH, and pest troubles (link to website other than RIU)
https://www.icmag.com/ic/showthread.php?t=11688

^^^ I'd reccomend bookmarking that last link there