To start off with im using a aeroponic system with silica stone and 420 watt floresenct light with about 15 inches of canopy space. Ialso have co2 and im keeping the temp at an even 85 degrees. In the beggining i used the instructions on the bottle of general hydroponic "flora" series nutriets. This hurt my plants pretty bad but since then iv'e had renewed growth and have basically fixed the problem. The new situation is that the leaf tips are browning and the older leaves are rapidly yellowing. I've changed the nutriet solution and it has helped some but i was hoping one of you guys could tell me a good mixture to use with the "flora" series nutrients and also any other useful info on keeping my plants healthy. This is grow number four for me but the first grow with aeroponics. Please hit me back soon my ladies would appreciate it.