You are dosing only 2 of the 6 macros and no micro nutrients. Based on the picture I see evidence of calcium and magnesium deficiency.
I would recommend getting Seachem equilibrium, and a micro nutrient fertilizers. Equilibrium is a gh booster that will provide calcium, magnesium, and sulfur. With the NPK you are now dosing that will cover all of your macro nutrient needs. Add enough Equilibrium to increase hardness by 2 degrees GH.
For the micro nutrients I would purchase CSM+B. These 2 plus your NPK should cover everything except chlorine, or nickel. Most tap water has enough of these 2 micro nutrients. If you are not using tap water add 2ppm of sodium chloride (table salt) that will resolve the chloride problem. there should be enough nickel in you fish food to do meet the plant need.
With the above fertilizers your inert substrate will be fine. No need to replace it.
I see no reason to continue using Envy. it is doing nothing for your plant. As to your liquid carbon it will damage and even kill Anacaris. Anacaris on of the few plants that is not compatable with liquid carbon. Liquid carbon if dosed incorrectly can kill everything in your tank. So My preference is to drop it and increase aeration of your tank water.
