I have a 48" 75 gallon aquarium with 500w metal halide retro fit kit.
I will put something better here when I no longer consider myself a New Hobbyist to the Salt Water Aquarium realm.
Coral Beauty Angel Fish, 2 Fire Fish, Mandarin Goby, Ocellaris Clown Fish, Pipe Fish, Six-Line Wrasse, and a Yellow Tang
Invertebrates: Blue-Legged Hermit Crabs, Cleaner Shrimp, Marble Starfish, and Sand Sifting Starfish
Black Sun Tube Coral
I swear they (Turbo Snails) aim for my Coral.
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.