standard 55 gal. low light (80 watts).
Try not to be a fish snob after you have a good grasp on taking care of fish. We are all still learning.
otos and various tetras and rasboras mostly
various anubias. java fern (Microsorum pteropus). onion plant (Crinum thaianum). hornwort (Ceratophyllum demursum), Cryptocoryne lucen. Rotala indica. moneywort (Bacopa monnieri). swords (not sure what kind)
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.