Leaf symptoms

If you calculate PPMs of what you give the plant, you can more accurately deduce the answer. pH (feed and substrate itself, but typically go hand-in-hand) and ratios of nutrients need to be considered too. yellowing bottom-up, but also necrotic spots but not neccessarily onthe oldest leaves and still kinda severe. I'd still make sure pH is proper and check lables/ calculate ppms, but looks like deficiencies, and i always hesitate to say that, becuase adding stuff blindly is a horrible idea 9/10 times.