To preface, this is my first grow, and haven't run into any issues up to this point. I noticed the tips around the edges start to 'burn'?
My setup:
- Coco coir
- Fox Farm nutes line
- Full spectrum grow LED 600w light @ 20"
- Water/Fertigate when light in weight (everyday or every other)
- 1200-1400ppm
- 6.0-6.3 PH in flower (truthfully been keeping the PH closer to 6.3 and not dancing within the 'acceptable range')
I flushed most recently this weekend (7/17), and the last fertigation bucket I started cutting my cal/mag strength in 1/2.
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I would get a jewelers loop, or get a good camera microscope, or use your phone's camera to inspect for spider mites, use loop/microscope for checking mold on buds harvested and terpenes, trichromes, etc. growing. I mention this because of your original post.
Kind of looks like calcium deficiency. Too much potassium can lock out calcium. You mentioned you just flushed. Let's see how they are in the upcoming days; hopefully the flush resolved it.
Autoflowers? Looks like slight nute burn.
Probably better to take a lic in regular lighting for better