Day 18 Spots on NL Autoflower

Mustrelax

Member
1st post, 1st grow. Searched the forum and pics are not available.
One Northern Lights Auto has these spots. Healthy one next to it is under same conditions. No idea if this is something to combat.

Pics show:
3 AC/DC. 2 NL Auto
INdoor under Kind 600 LED
Day 18 from sprout
Fox Farm with 40% perlite
Watering every other day
No fertilizer yet.
Light are on 24/7. Could this be light burn. Also, only ventilation so far is a small fan on low. Should i set up the exhaust fan/carbon filter this early?

Thanks! Learning a lot here!
 

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