It's to dry. Guaranteed. I'm not at home for the next 5 days, so I cant show you my pictures, but I had the exact same thing. I even hired someone from our grow shop in town to come inspect each plant I got to be sure as my eyes are shit for things that that small. No bugs. However the dryness was yellowing and crisping edges of leaves. Being under the direct light it dries up the water faster, but the plant is doing more under direct light and used it faster than expected. I have mine all automated now. Made my life way easier. Sprinkler system on a timer and it started doing better. But, could be anything else as well. Just my two cents, and probably not worth a whole lot lol. Also I am using stepwell soil