I read everything I could that @Emilya wrote before I started. It has helped immensely and my plants are looking very nice for a first try. The watering advice works... and it’s so easy!
Emily is right, over watering is the most common way of killing plants and the next is over feeding to me the dark green leaves with burnt tips suggests nitrogen burn i would lighten up on the feeding scheduled or dose.. maybe both
I want to know why you have it on a 24 hour light schedule? Is it an auto? If not, and hell even if so, every living thing likes a little rest now and then