Small yellow spots on 1 leaf

Hey everyone!

I'm having a small issue here. I'm 3 1/2 weeks from seed using Happy Frog soil. I just noticed small yellow/rusty color spotting on one leaf. Yesterday I checked my ppms and I noticed it had rose 200. So I stopped giving nutes (which were around 500ppm of nutes)and just gave it water. The next day I noticed the yellowing. I also checked for spider mites and I didn't see anything. Any thoughts on this my dudes?

Here is what i'm working with:

Private Reserve OG
3 1/2 weeks from seed
Cfl lighting
Happy Frog Soil
temps: 77-81/45-50 humidity
ppm: 500
ph: 5.8 - 6 (distilled water)

Here's some pics.

I don't have the foggiest idea of what your little spots are but I can say with certainity it won't affect your bud. Every grow I'd get some kind of spot on some of my fan leafs and I always produced kick ass smoke. So my advice to you is don't worry about it.You're ultimate goal is not to grow leafs but bud. Happy growing.

dude youre growing in soil. ph youre watering might be too low, check run off ph. it should be around 6.3 to 6.8

but like bullwink said dont worry about it. if its not affecting growth you're good.

Yeah, I do continue to see new growth, plus I just topped it at 3 weeks. Thanks for the feedback.

I've got an old Ghost cut that used to do that to me.. The gentleman who I inherited this from told me it may be a viral infection of some sort...

I used to just cut off the leaves that showed those signs to avoid spreading and eventually she would stop producing the spots. It didn't seem to affect yield.

I am interested in this topic if anybody has any more information..

no since worrying at this point. keep it green. GL

Appreciate all the feedback.