Flowering 400w HPS

RIght now they are about 6 weeks old and i just ordered a 400w hps light and some flora nutrients for bloom so in about a week or two should know sex. RIght now they are under 2 72w cfls and advanced micro and grow nuts. tell me what u all think. and all of them are bagseeds so very curious on what i get and please take in consideration that this is my first grow

Hi i just recently put the plants into 24 hours of darknees before 12/12/ just to see if it works. and also i was wondering when to put in the nuts for flowerin. i just about to flush my resv. and put all new nuts in there or should i just use water for the first week or two.... please put some input!