Yellow spots starting to show up on fan leaf

[Byow88]

This is my first grow in probably 20 years and back then I was growing Mexican dirt weed out side. But anyway I have a few autoflowers going and I noticed a yellow spot at the tip of a fan leaf and then today noticed another spot on the same leaf. My question is is this normal with autoflowers is the fan leaf just dying off? Im at 4 weeks from seed and plant seems to be thriving. The plant seems healthy and happy other then these spots. I haven’t seen any bugs and a treated my closet with Diatomaceous earth before I put pots in and then treated top of soil with it about 2 weeks into grow just to make sure if bugs showed up the plants would have something to fight them off. Any help would be much appreciated.

 

[Dilago]

Check with a magnifying glass underneath the leaves if you see any bugs.

 

[Gentlemencorpse]

Possibly minor nute burn, I wouldnt worry much unless it spreads ... whole plant pics are always helpful btw

 

[Byow88]

Possibly minor nute burn, I wouldnt worry much unless it spreads ... whole plant pics are always helpful btw

I must of been reading you mind just took a pic of the whole plant.

 

[Byow88]

 

[Byow88]

While looking under leafs for bugs I found another leaf with damage. I haven’t spotted any bugs as of yet.

 

[Dilago]

Lucky for you that there are no bugs! I wouldn't worry about the little burned leaves, just keep giving the plants the right values and they'll grow over it.

 

[TropiKanna]

you dont have enough drainage or aeration in your coco... probably overwatering or not letting your pots dry out enough before watering/feeding