I've follow the direction for the cal mag and the pure grow in regards to ratio per gallon, the desired nutes are for Nitrogen: 160-250ppm, Calcium: 160-280ppm, Magnesium: 45-75ppm and Iron: 2-7ppm. I don't have a ppm meter but i should looking into purchasing one

The tip of my leave seem to be turning brown, I need to get these guys some nutrients and food. Apparently the two solutions aren't cutting it. What to do? Remember this is a hydroponic drip system. Thanks again guys