hey bro...
im using a top feeding drip system, 4x 15litre pots with hydroton as the grow medium, im using a 30 litre quantity of water/nutes in a 60 litre res.
im going with growzilla a and b(with nitrozome for added boost), and will move into budzilla a and b for flowering(with headmaster to boost).
at present i feed every 3 hours for 20 mins using 120mils of growzilla a AND b per 30 litres giving me an ec reading af approx 1.8(18 cf).
im on 24 hour light cycle at present and will up nutes to 2.0 ec with next res change in about 5 days, when i go into flowering i will up ec to 2.4 on same time schedule of every 3 hours for 20mins.
just a brief rundown of what im doing albeit with top feeding drip system.
best of luck for your grows dude!
peace