29 gallon tank, AquaClear 50 power filter.
Keep up with water changes, try not to overstock.
Over the years (not all at once) I've kept a few angelfish, glowlight tetras, swordtails, corydoras, tiger barbs, and kuhli loaches just to name a few. I had two aquariums.
I got really interested in aquariums when my Dad started his 55 gallon aquarium. I was really intrigued by the fish he kept!
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.