Black Gold is a soil ammendment, not a potting soil. Likely it's way too hot for container use. According to the ad for the stuff: "Use to amend your soils and provide a jump-start to the helpful microbes in your soil." There's nothing in it to promote proper drainage (perlite, for instance) either.

Is the lamp a plant spot light, or are you using 125w of CFL's?
Vitamin B1 is not a fertilizer.