Aqua One AR-620 with powerhead mechanical and biological filter, two 20 watt blue/white globes, air stone, sand substrate and fake plants and logs.
Always read up first on the fish you want to include in your aquarium. A lot of tropical fish can grow quite large! Don't forget to test regularly for pH, ammonia, nitrItes and nitrAtes.
It's better down where it's wetter take it from me - The Little Mermaid
Fish are friends, not food - A Shark's Tale
I've been into fish keeping for over 3 years now, I have 3 tanks, 1 tropical, 1 cold, and 1 turtle.
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.