New grower

im also sure it's a pH problem, giving pH corrected water should help hard to tell without any more info

Hey! i can't tell 100% without knowing all the environmentals, but it seems like she is overwatered? stunted growth and discoloration looks like it. How big is the pot? In the picture it looks quite big and maybe you tried a little too hard to take care of the soil and overwatered her, but that isn't easy and we all do these mistakes. Photoperiod can recover, automatic will be hard im honest :/ Gl tho!

necrotic signs similar to extreme cal-mag issues. most likely also something wrong with ph. what is the pffd? do u have any data about ur water? is this a soil grow?

Over fed and burned. Without a diary and no other info other than a random picture, this is the best an answer can be. Every plant is an individual and what may be fine for one, may not be the best for another. You need to watch and respond to plants individually and adjust fertilizers as required.......this plant has been burning for a while already, reducing the fertilizer earlier would have prevented it getting this advanced. Next time, if you are unsure, ask questions as soon as symptoms appear, rather than letting it go on and hoping it will be ok.

looks a bit like PH to me. and maybe because the medium is over saturated from a improper dry/wet cycle.. just a guess though.