Yellow leaf spot? Any idea what this is

[Tommy626]

Also here is a photo of leaf septoria spotting under microscope

 

[Aqua Man]

View attachment 1012897Calcium deficiency does not start on low old leaves. Calcium will show on random leaves no matter the age, but in the foliage that is receiving the most light. I.e usually on top of the plant.
Put a teaspoon of epsom salt on top of the soil and rub it in and water it in with your next scheduled watering. Also here is a reference chart for you to look at so you can self diagnose. One thing I have definitely learned in the past year or so is everyone has a opinion, and a lot of times they are all different! Lol

I agree but still also think it's multiple deficiencies and just an overall lack of nutrients.