yellow spots. caused by heat?

it can get a little hot in my box, sometimes high 80s but as the fall weather slowly sets in it will go down to about high 70s in my room.

think its the heat? its only small spots on a few leaves.

don't think it could be the heat unless you got a little bit of nutes on the leaves, maybe a small Mn or Fe deficiency.

just looks like a really small def to me

yea thats not heat, heat will make them bend upwards.
what are you feeding them

no feeding yet, thats why i asked. the soil has slow release nutrients. im not sure about the npk levels, ill have to tell ya's when i get home and look.

the spots seem dry and crispy.

shes about 3 weeks old and around 7" tall maybe.

Light burn.