@Lakepeace Just looking at the plant it looks like light burn symptoms, although, the SF1000 at 24" away makes it unlikely. What is the pH and PPM of the soil runoff? Also, has the temperature and humidity in the grow tent always been what's shown on the monitor in the picture? Or does the temperature increase higher than that?
.png)
Lots more information is needed in order to properly diagnose. Read this post so you know what to include:
https://www.mrgrowit.com/forum/grow-community/read-me-first