With proper care, they can live 10-15 years, sometimes much longer, making them a long-term commitment. They teach responsibility without needing walks, but demand consistent care and a proper environment. 

Forget bowls! A single goldfish needs a minimum of 20 gallons, with more space needed as they grow; common goldfish need much more than fancy varieties.

They produce a lot of waste, requiring powerful filtration and weekly partial water changes (25-30%). Use a water conditioner for tap water.