regarding Pythium Wilt (which sounds exactly what ya got goin' on there), is primarily caused by the soil being kept too damp ... also, cool, damp soil is really the worst ... Pythium Wilt (damp-off) can get a toehold during the wet towel presoaks, and then worsen once in the soil ... also, a 400-watt HPS is pretty intense for a young seedling, even at a 3-4ft. distances ... early vegging growth is a perfect place to use fluorescents ... also, as with all seedlings, NO nutes for the first two weeks ... NorCal Daddy's Girl, doesn't need heavy feedings ... I recommend 1/2-strength, mild,fertilizer solutions, applied once weekly ... you can always add more, if needed, but she really is a pretty light feeder ... once she gets going. just let her have her head ... she is very hardy, and trouble-free ... and, don't hesitate to ask me questions about her, that's why I'm here