Hello! Can someone please help me. I had this lemon tree that is being kept indoor. I heard two reasons for yellowing leaves can be over watering or nitrogen deficiency. I didn't water it for 5 days and I feel the leaves got worse as in they become yellow! I also gave it fertilizer twice within two months. I am not sure what else I need to do. I have attached some photos of the plant itself and the fertilizer I used. Also one of the lemons is turning brown, and I am not sure what the reason for that is. I know sunlight is an issue since winter is coming, and I am planning on getting artificial lights. I appreciate any help!