Black spots on lower fan leaves!!!

Black spots on lower fan leaves and weird small tan spots on main stem plants still look healthy but these spots are bothering me.
any help guys?


Picture of problem "sorry bad quality"

maybe heat stress!
what type of set up are you running?
Lights?
Temps?
Nutes?
Grow Medium?
PH?

oj1981 said:

maybe heat stress!
what type of set up are you running?
Lights?
Temps?
Nutes?
Grow Medium?
PH?

Click to expand...

Exactly, nothing can be determined without some background.

How old is your plant?
any pics of the whole of the plant?