This grow shouldn't be low in nutrients. The grower is using Roots soil, which has nurtients. three kinds of additional nutrients are being given, liquid fert, calmag, and budsbuddha, whatever that last one is. There's some dark green leaves with dying tips, which tends to mean over fert. The light green and yellowing that's showing can be due to over fert as well. But do what you feel is right. You haven't written exactly how much you given of that stuff, so it's hard to tell, but giving so much fert is usually the cause of a problem when you are in soil that has nutrients.