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Proper habitat

-20-30 gallon tank at minimum

-Filter of the right size

-Good water quality

-Frequent water changes

-Decorations and plants to keep them entertained

-Frequent Gravel Vacuuming

Proper Food

-Variety

*Vegetables

*Flakes

*Bloodworms

*Pellets

*etc

-Pre-soaking food to prevent air from getting in your fish's body

Large tank.

Filter(s)

Cycle the filters.

Feed the fish a good diet.

Water conditioner for the new water.

Frequent partial water changes.

If you dont have all of those things right, your fish usually end up dead. But those are all you need to keep a fish alive for years.

Ian

50 gallons of water

over filter the tank like 9 times the correct filtration

feed small amounts of food

use an airpump

have live plants

Huge tank

Lots of filtration

Plenty of live plants

Varied foods

Lots of decorations and hiding spots

Treat diseases as soon as they come up

Regular cleaning of the the tank