Hey there, I saw your comment on my post, which documented similar spots on my plants. I think I figured out how to get rid of them. I raised my light distance, and lowered my humidity (in case it was fungus). Raising the light to 30+ inches seemed to help, I think my seedlings were sensitive to the powerful LED. Not sure how strong your light is. Also, what kind of soil are you using? Some soils can be a little hot for autos.