These leaves started to turn brown and got burnt ,dry on top.There doing this under both lights 1000 watt hps lights.Started turning shortly after i flushed with fox farm sledge hammer bushdoctor
When you get the photo posted we will be able to help check the guide linked by 420girl. Just as a guess with it being browning tops I would think it is a temp issue/light burn. Photos and a description of your setup will help greatly.