Hi guys, just got my first setup from spiderfarmer, i’ve got Tropicana Cookies Auto on hydroponics. Unfortunately i have been having the issue you can see in the pic. The bottom leaves seem to be rusting which should be a ph problem, but the ph has been more or less stable (5.7 to 6.3 range). Looking for help, I flushed the solution a few days ago and replaced it with a new one but the problem persists.
Thanks in advance
https://imgur.com/a/x75FSsW.