Sensi Skunk

Hi Wanderlust93, looking at your pic I would say its overwatering. One of the most common mistake everyone runs into in the beginning ESPECIALLY with Soil. I see you are running LEDs as well which don't emit as much heat as lets say an HPS therefore this will keep your temps lower and seeing your room temp in 70F I would definitely say if you are watering more than once or at most twice a week at the stage of growth you are at, then overwatering is your issue. Hope this helps. In the meantime let that soil dry out and see how the plant reacts. Its still early in your growth cycle but once you get root rot its pretty much game over. Best of luck. Cheers!