nah man not 24/7 when the seedling comes up put it on 18/6. what strain is it? worry about hum and temp when the stem gets thicker and youve loads of leaves.. a big attic is the shit,cuz its nice and dry, my grow is pretty much the same as yours. ive four plants one indica and tthree sativas.soo they will grow at different rates thats where i fucked up.. but as for them meen time, just be paitent and wait. YOU HAVE ALL YOU NEED TO GROW SOME NICE BUDZ