In order to keep fish, tank cycling must be done properly. Good bacteria eat trash and turn it into nitrate. Cycling with fish is not ideal.
Cool water is what goldfish require, not warm. Fins can be torn by sharp ornamentation, and gravel is riskier than fine substrate like sand or big pebbles.
Poor living conditions result from selecting fish based solely on looks without taking into account their individual needs. Tropical fish and goldfish don't get along.
The size of the goldfish should be taken into account while choosing the tank size. Overstocking can be uncomfortable and create resource rivalry, necessitating greater upkeep.
Goldfish have a high bioload, thus they require strong filtration. Underfiltering could be harmful to them. The optimum filter is a HOB/canister unit with a sponge filter. For further information, see The Truth About Goldfish.
In addition to commercial pellets, goldfish require a diversified diet. Gel, freeze-dried, frozen, live, and fresh produce should all be consumed in moderation.
To remove excess nitrates that accumulate in a cycled tank and can kill fish if not removed, regular water changes are required.
Poor water quality is a common cause of goldfish disease. Medication-assisted symptom management may increase stress. The best course of action is prevention through water stewardship.
Replace filter cartridges less frequently by rinsing them in the soiled tank water. To keep bacteria alive, use ceramic rings and long-lasting sponges.