Hi there Balansa, your moby dick has magnesium deficiency, you can tell because the leaves are yellowing between the veins. You need to add cal mag to the feed, maybe do a cal mag spray ( 2 ml / L ) if you're brave enough and not scared of the mold issue. Basically the intense light schedule is putting the plants into overdrive and they need more micro than they can absorbe. Secondly the coco medium doesnt contain any micronutrients like the soil usually does, so you really need to add cal mag from day 1. Now, you have a pretty serious problem and hopefully the plant will recover and the problem will stop spreading in 10 to 14 days after you start fixing this. Hope this helps ! 🚀