Freshwater tropical fish tank.
Buy a Stingray.
African Butterfly Peacock, American Flagfish, Bristle-nose Catfish, red tail shark, Jack Dempsey, Bushy Nose Pleco L-144, Convict Cichlid, Electric Blue Jack Dempsey, Silver Dollar, Red Marlboro Discus, Kyoga Flameback, Dragon Blood Peacock, yabby, Black Widow Tetra, Hongi, flameback chiclid
"I lose minutes, hours and even days doing everything and anything to my freshwater fish tank"
My ex had a couple tanks and I liked them. It started as a hobby but now its an obsession.
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.