Predatory planted tank
Keep it as simple as possible while keeping it as cool as possible.
1 spotted gar, 2 ornate bichir eels, 3 plecostomas (one of them is over twenty years old!!!), and one jewel chiclid
I really went with a variety of species many of which I didn't keep track of but I do know that I have a onion plan and also a very nice sword.
It's not a tank it's a colliseum of death!
When you see signs of stress in your fish, you can then take steps to identify the source of that stress and then to resolve it before it becomes a major issue.
If you're looking for a unique way to stock your new tank, give freshwater shrimp a try.
If your fish is suffering, you may want to consider euthanasia as an option to humanely end his pain.