Ohh yea about your problem, keep your water level about 1" up on the net pots until you have some roots coming out the bottom then lower the water to about 1"-2" below for the remainder of the grow. As everyone has said start your PH at 5.5 and let it climb to about 6.2-6.3 before slowly bringing it back down. You will also need to purchase PPM meter, you cannot have a successful grow without both a PH and PPM tester. Change your res every other week and use H2o2. Just follow all of rose's plans, hes the man with these systems. I am very happy with mine so far. I'm also new to hydro and was a little worried about all of the ph and ppm stuff now that I've learned its way easier than messing with soil...Keep it up.