CE-CE

i,m setting up my grow room. i choose a 400watt mh, a 60watt flouro and humididome for germination and seedlings, painted my entire room flat white and in the process of assembling a continuous drip system for five babies(not germinated yet) i,ve put a lot of planning and research in before i started. my only question now is what you guys opinion is of the best hydro juice to use in my system. and do i start to use that or plain water on my seeds when i germinate in rockwool? or wait until i transplant into gravel.