Hey. Im not sure that it is spider mites.
I just moved them from fluorescent lighting under a 250 W HPS. So i think the light yellow parts could be burns. It was drooping and had the dark black spots before that though.
I have two successful plants in this soil, therefore cannot be the issue. One of my plants has already died. i have two plants that are going through this right now. If you need better pictures let me know..
Thanks