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help anyone? :'(

Ok so I have a hydroponic drip system. The pH of the water is between 5.5 and 6.0. The plants are about 2 weeks old seated in rockwool. There is a very small amount of rooting hormone (about 1/2 the suggested amount). Until funds pick up a little I am using a 120w gro-bulb by Sylvania. It...