Goldfish Facts:

Scientific Name : Carassius auratus auratus
average adult size:4 to 9 inches long
average life span:10 - 15 years
diet:omnivore - flakes/pellets
minimum aquarium size:15+ gallons
water parameters:


pH: 6-8


A well-balanced Goldfish diet consists of:

  • Food may be flaked, pellet, frozen or live.
  • Avoid exclusive food which is not nutritionally complete.


Things to remember when feeding your Goldfish:

  • Feed small amounts 1-3 times daily, no more than fish will eat in 3-5 minutes.
  • Thaw frozen foods if you choose to feed frozen.


  • Keep in an appropriate size aquarium; provide plants for hiding, various species may prefer sparse or thick vegetation.
  • Stable water quality, water temperature, and pH levels are critical to the health of the aquatic life. If you are unsure of your water quality or pH levels, Home Aquatics offers water testing.


  • During the breeding season the male has white prickles, called breeding tubercles, on its gill covers and head.
  • Seen from above a female will have a fatter appearance when she is carrying eggs.
  • It is impossible to sex Goldfish when they are young and not in breeding season, but generally the male is smaller and more slender than the female.

Habitat Maintenance

Daily: Check filter, water temperature and other equipment.
Weekly: Check water quality at least once a week.
Monthly: Change 10-25% of the total volume of water every 2-4 weeks, or as needed.
Introduce new inhabitants to the aquarium gradually.


Goldfish are compatible with most peaceful species of fish. Goldfish, however, create a lot of waste, so it is important to be frequently changing some of their tank's water out with fresh water. 


Signs of a Healthy Fish

  • Clear eyes
  • Healthy appetite
  • Bright, even coloring
  • Clean in appearance

Avoid overcrowded conditions; they are a major cause of stress and disease. Maintain good water quality with regular water changes and adequate filtration.

Red Flags

  • loss of color or appetite
  • spots or fungus on body or mouth
  • erratic swimming
  • frayed fins

Common Health Issues

Health IssueSymptoms or CausesSuggested Action
Fin rotFrayed or disintegrating fins; the base of the fins usually reddens.Improve water quality; consult your aquatic veterinarian for treatment.
IchWhite spots appear on fins and body; fish rubs against hard objects or swims awkwardly.

Quarantine fish immediately; use a commercial ich remedy for at least two weeks

Common Goldfish are some of the hardier species of goldfish. They are very undemanding of water quality and temperature. They can do well in a goldfish aquarium or even a pond as long as the environment is safe and their tankmates are not competitive.

The environment the Common Goldfish is kept in is a determining factor on whether your pet will grow to its full potential size or remain somewhat smaller. In an average 15 gallon tank, if well cared for and not crowded, they can grow up to about 4 inches (10 cm). In a larger, uncrowded tank, they can grow generally reach about 7 or 8 inches (17.78 - 20.32 cm). If kept in a spacious pond, they can reach over 12 inches (30+ cm) with some hobbyists reporting their goldfish reaching up to a whopping 18" (45+ cm)!

Goldfish are very social animals and thrive in a community. Not only are they a great community fish, but they are great scavengers as well. It is really not necessary to add other scavengers or other bottom feeders to the aquarium when you have goldfish.

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Hand-Picked Comet Goldfish

  • Brand: Home Aquatics
  • Product Code: Hand-Picked Goldfish
  • Availability: 2-3 Days
  • $3.99