the tap root should be faceing down but i guess u have all ready figured that one out now lol. any way the mh on its own should be enough for now but the more the merrier lol. is there no way u can move your grow inside to control the temps better coz wen u go 12/12 ur gonna run into problems. have you got any pic's then i can make some propper suggestions? hope its all going ok for you peace!!