Have one bastard plant that is showing signs of light burn... have one that is the same strain that looks perfect
Same strain....below
The rest of them are fine with no signs..., think it may just be An overly sensitive pheno... below are my other plants...
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May actually be overwatering. I say that because I see damage on the lower leaves as well. More info: https://www.mrgrowit.com/post/over-watering-cannabis-plants
Do you have a heater in there? Whats your ph ppm runoff , what light and distance