small yellow spots?

I can't seem to figure this out. I'm using Black Gold soil and Reverse Osmosis water w/ General Hydroponics Maxi bloom/grow nutes (switching to GH Biothrive orgainics). My temps are hotter then i want them @ 80+ degrees and the Humidity is lower then it should be (20%-40%). I have no bug problem, that i can find. Any help would be much appreciated! thanx.

Looks like a calcium issue.. possibly Manganese as well.

https://www.rollitup.org/marijuana-plant-problems/488004-guide-nutrient-deficiency-toxicity.html

I'd vote calcium. CaMg+ from General Organics (GH). RO water has removed it.

Thanks for the help. i'll make some adjustments and give an update.