I'm on my 4th grow in a well ventilated 3X5 closet. I am using a 400w HPS for light and using General Hydro for nutes. My problem is everything goes good through veg and after I start into 12/12 my fan leaves start to yellow. I am growing in soil and I am about 4 weeks into flowering. The flowers are looking green but the fans are all turning yellow. Everything looks healthy but yellow. I don't show any signs of over nuting just yellow leaves. Any suggestions?? In some of my books it says it could be a possible (P) Potassium defiency. Any truth to that?? Not sure if you can tell much from the pics. Thanks
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