m0useanswered grow question 3 years ago That's no aphid...
That's a black spider mite.
I suggest you go to war if you want to save your plants.
Figure out where it came from and destroy them all!
Check other house plants as well.
Some good news, its not the dreaded two-spotted spider mite, it's very destructive to cannabis and resistant to chemical treatments.
Best Of Luck.