Nitrogen deficiency?

Hi there Dig this, you have an imbalance on you NPK which is 2-1-3 when it should be 2-1-1 or 4-2-2. It's a good idea to use both parts 1 & 2 so that you get a balanced NPK profile. So you're seeing discoloration because it's too hot as well, but it's messing with your roots . The downward pointing tips means you have root problems, so it seems your additive the Fasilitator contains growth hormone but you're actually looking for an additive that can treat problem roots, try out something like beneficial bacteria, humic acid (which is the best) , or fluvic acid. If you fix the roots in this way and make sure you keep a strict wet dry cycle the problem will stop spreading immediately and the plant should look better almost instantly. If you dont fix the problem it could get worse until the plant is really struggling. Hope this helps ! 🚀