Good luck with the grow. Can I just suggest with autoflowers starting them in their final pot, transplant tends to shock them & slow down growth.
Also I would personally start them indoors under a light 24/7 just to give them a head start.
If you think they have spidermite check the underside of the leaves for mites and eggs.
I'd be surprised if you had mite already, possibly over watering though.
Again good luck with the grow
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