I swear I have the same issue.......first transplant your plants into some 6-8inch potters.

Looks like a fungus....black spot....thats what I have
VapedG13 Reviewed by VapedG13 on . HELP ME PLEASE!!! My PLANT IS DYING! I need help with my plants, i dont know what the problem may be. Setup: HPS 600W 24/7 thats been on since they where seedlings. Good Ventilation, big space. The plants are about 40-50 cm from the lamp. The temp is about 25-28c. They are being watered every two days. The soil is proffesional growing soil. . Rating: 5