gday mate i have read the whole eleven pages of stuff on here what u need is a+b solution any brand but use it exclusivley only mix what the directions say no more and do your maths twice!when topping up your resevoir only use fresh water not pre_mix nutrents change it completely every 9-14days at this time flush your plant for at least 1 minute each do not add any special big bud and all that other crap none of it makes a difference it just makes things more complicated i have had it all and its all just gimmicks u cannot substitute good plant enviroment with a nutrient in your system water temp should be 22C water for 15 mins every hour thrugh lights on period and 15mins every 2 hour through lights of period room temp about 24c dont worry about ph up and down just tap water in aus is good enough and weed has a pretty broad range keep plenty of air flowing over your plants at all times the more the better always keep lights about 35cm above weed later on down the track when u r a proffesor of pot u can wank over things such as ph, ppm,cf, co2 and all that but rest assured u can grow good weed withhout monitoring any of that just follow my directions im in tasmania and we have the best weed on earth and all that other stuff was invented to keep a hydro shop open on every other corner.