The comet goldfish (Carassius auratus) is a peaceful fish that grows to about 12 inches and spends its time all over the tank. It can be kept on its own, in a tank of 75 gallons or more, at 60–72°F and pH 7–8.4.
75 galsmallest tank
12″adult size
60–72°Ftemperature
7–8.4pH
1+group size
Peacefultemperament
Good tankmates
Avoid
- ✕Cardinal tetra: Comet goldfish and Cardinal tetra need different temperatures (60–72°F vs 73–81°F).
- ✕Glowlight tetra: Comet goldfish and Glowlight tetra need different temperatures (60–72°F vs 74–82°F).
- ✕Rummy-nose tetra: Comet goldfish and Rummy-nose tetra need different temperatures (60–72°F vs 75–84°F).
- ✕Congo tetra: Comet goldfish and Congo tetra need different temperatures (60–72°F vs 73–82°F).
- ✕Marbled hatchetfish: Comet goldfish and Marbled hatchetfish need different temperatures (60–72°F vs 75–82°F).
- ✕Golden pencilfish: Comet goldfish and Golden pencilfish need different temperatures (60–72°F vs 75–82°F).
- ✕Cherry barb: Comet goldfish and Cherry barb need different temperatures (60–72°F vs 73–81°F).
- ✕Betta: Comet goldfish and Betta need different temperatures (60–72°F vs 76–82°F).
From TankCoach's own species data: common hobby guidance for adults, rounded. Individual fish vary. Not veterinary advice.