brown spots on my auto flower

[marpolo]

about 3 weeks in to this one, just noticed today. any info helpful, thanks!

 

[marpolo]

look healthy other wise

 

[marpolo]

chocodope, jack herrer and red russian XXL, all auto flower

 

[PRIMO]

Add cal-mag to their diet, and turn off your goofy lights and use the flash on your camera for better photos.

 

[marpolo]

soil and perlite, using a Growth fuel, but only 1/4 tsp per gallon. PH is around 6.4..

 

[marpolo]

have an old ass phone, no flash,lol. but will try some cal-mag, thanks...