Hi!
At first I was like "Why the hell he's using LOx??"
Then I realised Growth Technology have a 12% Hydrogen Peroxide solution wrongly named "Liquid Oxygen". 🤦
Hydrogen Peroxide is a really great product.
On hydroponic systems, it add oxygen in the nutrient solution.
On living soil, it help to clean the soil of larvae or rotting BUT also kill micro-life (mychorize and other). In other words, it's for emergencies.
Now, to solve this situation, you may give your plant a shot of Cannazym + Rhyzotonic, it may help restarting micro-life in your soil.