problems and new set up

right now i have 2 supposed norther light, unsure if male or female. 2x250watt mh (3x4' reflector), 5 gallon pots, 2gallons schults moisture control plus( didn't realise it had slow release fert in it for 2 months) 1 gal of earthworm castings, 1 gal vermiculite. i'm having ph issues right now and am in the process of correcting with a good flush. all water comes from a 6 stage ro/di filter. after it is corrected and i gender them, i would like to put one a side as a mother. my question is a 2'x2'x6' tall grow box with 4x40watt t12s mounted verticaly at the corners with a 5.5'' fan for vent good enough to keep a mother and be able to take 4 clones every 2 weeks? i am building a bubble cloner, and plan on doing a small perpetual harvest sog setup using what i assume is a dwc system(kind of like bubble clone only larger using hydroton and net cups). i understand water better than soil, as i have been keeping reef systems and blackwater aquariums for years. nothing has been put to motion yet so any input before i start would be AWSOME! also i have been looking at foxfarms big bloom for nutes in the dwc setup, should i need anything else as i will be cloning in 6.8 water only and staight from the cloner to bloom room. i have a digital ph water meter, ordered a new tds meter(knocked old one in reef), and a cheapy light meter. is there anything else i should have?