hey there Skyhi, you have a calmag deficiency . you can tell from the yellowing on the edges and the rust colored spots on the leafs . That's because you have a heavy light schedule and the plant needs more calmag to regulate photosynthesis but it cannot absorb enough nutrients. you can try upping your calmag (bioheaven, i think) or try using your calmag in a spray twice a week to try to treat the symptoms and to treat the root cause you would do well to reduce your light schedule as much as you're comfortable . If you're not using calmag, you'll definitely need to start using it. Hope this helps ! đ