Coco coir right? It doesn't look like you're following general recommendations with not letting the pot surface dry out and feeding to run off everyday?
I generally feed 3 times a day in veg and later 5 times a day in late veg and flower as an example. You don't need 400w of LED for the stage of growth you're in, save money on your power bill! More light is not always better.
Coco coir should never dry out and should stay wet. I use regular unscented bleach to remove any algae growth and add oxygen back to the solution. You'll find the dilution calculator with recommendations in my signature. I add 2ppm to anything going in to the reservoir when running soilless ie peat or Coco coir.
Cheers!
