Heyya folks, been seeing more and more of this lately, these rusty lookin leaves. Trying to figure out what it is. Been affecting the Outter most leaves, mainly the ones furthest from or hidden from the light but now seems to be happening more and more. Pulled the first few off as they were small and didn’t seem all that important but I’m starting to get worried. About four weeks into flower, give or take, indoor grow. Temp and humidity well controlled. Any ideas as to possible causes? Been looking for signs of pest and can’t find any. Nutrients have been very minimal but haven’t cal/mags anything. I use a third tap water mixed with distilled to get some of the micros in there. Not much of a science, just know there’s some calcium in the water. Lol. What gives? Any ideas or possibilities? Or am I overlooking something terribly obvious?