hey there Vamp, i'm seeing the start of Mg deficiency from the yellowing in between the leafs starting at the base moving up and affecting the new growth first. That's because it's an "immobile nutrient". The root cause of this is the intense light schedule. If you can you should decrease it to reduce the light stress. You can also make a cal mag spray (same dilution as the feed) and spray a couple times a week. Absorption through the leafs is 80% efficient , compared with 20% efficiency at the roots. Hope this helps growmie ! ๐