


Species Profile
Fantail Goldfish
Carassius auratus var. fantail
GoldfishpeacefulLong-finned
Adult size
8″
Minimum tank
30 gal
Temperature
65–75°F
pH
6.5–8
Schooling
Solitary OK
Water level
mid
Grows from juvenile
Typically sold at ~1.5″ and reaches 8″ over ~2 years. Plan tank size for the adult, not the fish at purchase.Diet
Sinking pellets, blanched veggies, frozen
Notes
The classic starter fancy with a twin tail fin; hardiest of the fancies. More forgiving of beginner mistakes than oranda, ranchu, or pearlscale. Pair with other fancies in 30gal+; never with single-tailed comets or commons.
Compatible Tankmates
Best tank mates for Fantail Goldfish
Every species below passes the compatibility engine when paired with Fantail 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.

Oranda 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.

Lionhead Goldfish
ExcellentPeaceful pairing — temperament, water parameters, and size all line up.

Paradise Fish
ExcellentPeaceful pairing — temperament, water parameters, and size all line up.
Photo: ProjectManhattan / Wikimedia Commons · Source · CC-BY-SA-3.0