Leaf tips yellow-brown, new leafs light green, lea...

Hey MMorrelo , you're seeing cal-mag deficiency even though you're feeding cal mag because the "heavy" light schedule put the plant into overdrive and it's using a lot more calcium than it can absorb. That's because absorption through the roots is efficient only at 15%. What you should do it double the cal mag in the feed, feed cal mag every time, and consider a cal mag foliar spray 2 ml / L two or three times a week for 10 days or 2 weeks until the problem stops spreading... and i know you dont want to hear this, but maybe consider reducing the light schedule to 18/6 just to "quiet down" things until the plant is healthy again. Hope this helps ! 🚀