Hey spliff. You definitely want to remove those dead leaves. It can attract pests and become a nightmare. I also see the nutrient burn that you are referring to. I would give them plain ph adjusted water for the next few waterings. It also looks like there may be slight overwatering going on but photos under the led can be deceiving. I keep a small regular light bulb in my room for taking pictures. I also turn my led off when I check on them so I can see any issues more clearly.