Mr. Clandestine is correct, you are running a bit low on the nitrogen, but, don't take that as a pass, to over-fertilize now ... in general, you'll have good results, with 1/2 strength nutes, once per week, adding more, only if necessary ... also, the overwatering suggestion could be correct, as yellowing also occurs there ... but, keep in mind, the plant draws food from the leaves, too, during flowering ... the further you go into flowering, the yellow leaves will become more numerous, perfectly normal ... happy gardening :smokin: