You want me to give you rep for telling me I may have a little bit of heat burn without telling me why that plant is getting burnt but the ones right next to it are fine.. It's not even directly underneath the grow light... and still it's plenty far away & the heat at the canopy is 86F.
You haven't told me anything that I didn't already know.
No REP for joo!
U see... reading about this kind of problem found that it could be many things... heat... water...nuts...
Started a thread to find out... but no comum ideas...
I think I could be the heat stress maybe....86 F are nearly 30C which is like growing cannabis over the equator line...
Im having the same problem but didn t realize that the box was too hot and humid (28C and 69%)...
Also, I have AF plants and they are 60 days old... into flowering... It could be a lack of P and K... to much N ( I did some foliar feed... but just one got the issue... dont belive it was the case)
Some guy said it was over watered...with is not my case...
So... as an expert grower like u... u probably did the basic check-list... ph ... temp... moist... vent... and seems a mistery.
I intent do buy an EC tester to make sure all is doing fine... but until that... just wondering...
DO the tests... stay closer...
How old are yours? Is it weel vent? The ph is correct... as u say... u planting diferent strains... and It may be the difference...
Post some pics of mine to make sure we have the same problem.
Lets keep talking... cheers