Species Profile
Comet Goldfish
Carassius auratus var. comet
GoldfishpeacefulLong-finned
Adult size
12″
Minimum tank
75 gal
Temperature
60–72°F
pH
6.5–8
Schooling
Solitary OK
Water level
All levels
Grows from juvenile
Typically sold at ~2″ and reaches 12″ over ~3 years. Plan tank size for the adult, not the fish at purchase.Diet
Pellets, flake, blanched veggies, frozen
Notes
Slim-bodied single-tailed goldfish variety with long flowing fins. Fast active swimmer that outcompetes fancies at every meal; never mix with oranda, ranchu, or any fancy. Properly belongs in a pond or 75gal+ aquarium.
Compatible Tankmates
Best tank mates for Comet Goldfish
Every species below passes the compatibility engine when paired with Comet Goldfishin a suitably sized tank. Verdicts come from the same rules the builder uses — click a card to see that species' own care profile and its tank mates in turn.
Zebra Danio
ExcellentPeaceful pairing — temperament, water parameters, and size all line up.
Gold Barb
ExcellentPeaceful pairing — temperament, water parameters, and size all line up.
Pearl Danio
ExcellentPeaceful pairing — temperament, water parameters, and size all line up.
Hillstream Loach
ExcellentPeaceful pairing — temperament, water parameters, and size all line up.
Peppered Corydoras
ExcellentPeaceful pairing — temperament, water parameters, and size all line up.
Weather Loach
ExcellentPeaceful pairing — temperament, water parameters, and size all line up.
Common Goldfish
ExcellentPeaceful pairing — temperament, water parameters, and size all line up.
Ranchu Goldfish
ExcellentPeaceful pairing — temperament, water parameters, and size all line up.
Black Moor Goldfish
ExcellentPeaceful pairing — temperament, water parameters, and size all line up.
Mystery Snail
ExcellentPeaceful pairing — temperament, water parameters, and size all line up.
Paradise Fish
ExcellentPeaceful pairing — temperament, water parameters, and size all line up.
Photo: G29 / Wikimedia Commons · Source · CC-BY-SA-3.0