Black Spots On My Pot Plants – Indoor Weed Growing Question

Description I have black spots on the leaves of my cannabis plants! After I killed the spider mites, it seems I over watered the weed plants - then they contracted another kind of trouble. Have any tips and ideas on what this is and how I should prevent this in the future? If you have questions about juicing cannabis and the beneficial effects of medical marijuana, please see the playlists we have collected for this channel!