CheckMyFishTankComet Goldfish care
Carassius auratus · Freshwater · Beginner level care
A fast, single tailed goldfish that grows large and suits big tanks or ponds.
Feeding
Twice a day. Only what they finish in about 2 minutes, since goldfish always beg for more. Goldfish pellets, blanched vegetables, occasional protein.
Good tank mates
Fish that pass every check with Comet Goldfish in a 150 gallon tank: same water, overlapping temperature, nobody gets eaten and no bullies.
Do not mix with
- Cardinal Tetra: Cardinal Tetra and Comet Goldfish need different water temperatures.
- Glowlight Tetra: Glowlight Tetra and Comet Goldfish need different water temperatures.
- Rummynose Tetra: Rummynose Tetra and Comet Goldfish need different water temperatures.
- Diamond Tetra: Diamond Tetra and Comet Goldfish need different water temperatures.
- X-Ray Tetra: X-Ray Tetra and Comet Goldfish need different water temperatures.
- Emperor Tetra: Emperor Tetra and Comet Goldfish need different water temperatures.
- Silver Dollar: Silver Dollar and Comet Goldfish need different water temperatures.
- Golden Pencilfish: Golden Pencilfish and Comet Goldfish need different water temperatures.
Questions
What size tank does a Comet Goldfish need?
At least 75 gallons. Adults grow to about 12 inches, so plan for the adult size, not the size at the store.
What temperature does a Comet Goldfish like?
60 to 74 degrees Fahrenheit, with a pH of about 6.5 to 8. A steady temperature matters more than hitting one exact number.
How many Comet Goldfish should I keep together?
One is fine, and they can also live in small groups if the tank is big enough.
What do Comet Goldfish eat?
Goldfish pellets, blanched vegetables, occasional protein. Feed twice a day: only what they finish in about 2 minutes, since goldfish always beg for more.
Sources
Checked against these sources on 2026-11-10. When sources disagree we use the safer number.