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It is best to keep only one or two goldfish per suitably large tank, ideally 40 gallons or more, as goldfish grow quite large and produce a lot of waste, making overcrowding harmful to their health.
Do use a large filtered aquarium, perform regular water changes of about 30% every two weeks, provide a varied diet including quality goldfish pellets and vegetables, maintain water temperature between 65-75°F and pH of 6.5-7.5, and condition water before adding fish. Don't overfeed, keep them in small bowls, overcrowd the tank, or neglect filtration as goldfish produce significant waste.
A happy and healthy goldfish will swim actively, have bright eyes and vibrant colours, eat normally without overeating, have smooth scales, and respond curiously to your presence. Signs of unhappiness include lethargy, loss of appetite, erratic swimming, or physical signs of illness.
