72 Gallon bowed front tank.
Cascade 1200 external canister filter
2 Powerhead 402 filters, with sponge attachments.
Ask questions. Keep records/notes. I learned more by trial and error than the local fish store.
1 kissing gourami, 5 danio, 1 betta (male), 1 female betta, 2 crabs, 1 loach (not sure what type, eel looking). Currently restocking.
Don't now what types.
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.