Be careful with matricide, there's a lot of misinformation on it being aquarium safe, and given that its carcinogenic and how its handled in a lab environment I wouldn't really be messing with putting it into an aquarium. Gary Lange wrote an article on it, and several other big name aquarium hobbyiests with verifiable scientific backgrounds and who are just straight up scientists have written on the subject and basically agreed that using metricide as an excel substitute is not the safest thing in the world. I tried to use it before I knew and it was meh, I find regular excel works better if you're going to be doing any liquid carbon...and even then excel really isn't necessary either.
The biggest issue you're going to have with this tank is BBA, and I learned the hard way that its because of the type of waste that a heavily stocked tank with larger predatory fish create. The plants do uptake nitrogen and all that that the fish produce but they won't uptake the larger organic molecules that the fish produce, which compounds quickly in a tank thats stocked such as yours. Therefore even if everything else is right you'll still get BBA issues, independent of the lighting or fertilization of the tank or any of that. BBA is a pain because it will grow on your plants, making it almost impossible to out compete, especially since it is using the nutrients that the plants themselves cannot uptake.
The two things that I've found help with that issue are more water changes (which tbh are only going to do so much) and the addition of purigen into the filtration. Purigen absorbs the larger organic molecules that BBA grows off of but doesn't significantly affect the smaller organic molecules that the plants are using to grow off of, so it cuts the fuel off for the BBA and causes it to significantly decrease in severity if not disappear almost completely. My 75 was having issues with BBA for the longest time, and I run a high tech system so its not even a thing of plants being out competed, but once I started using purigen in my filters it was almost immediate that the BBA in my tank significantly withered away. The only other thing that I've done that has helped me with BBA is spraying any BBA exposed to air when I do my water changes with hydrogen peroxide, that and spot dosing badly affected areas of the tank with both excel and hydrogen peroxide. Excel is relatively safe for fish (way safer than the metricide) and hydrogen peroxide basically turns into water and hydrogen once it hits water, so its difficult to OD on it when spot dosing or spraying it across the tank.