Common Goldfish

Common Goldfish

Carassius auratus

Also known as: Goldfish, Comet Goldfish

💧 Freshwater ✌️ Peaceful 🟢 Easy 🍽️ Omnivore

The classic pet fish. Grows much larger than most people expect — 12+ inches in proper conditions.

Tank Size

30 gal
minimum (55+ preferred)

Temperature

50–74°F
10–23°C

pH Range

6.5–8
water acidity

Max Size

12"
30.5 cm

Lifespan

10–15 years
typical in captivity

Swim Level

All
preferred zone

Care Notes

NOT a bowl fish. Needs at least 30 gallons for one, plus 10-15 more per additional goldfish. Coldwater — no heater needed.

Feeding

Goldfish pellets, gel food, vegetables (peas, lettuce), and occasional treats.

Compatible Tank Mates

Dojo Loach 10" Axolotl 12"

Use Caution With

Mosquitofish 2.5" Round-Tailed Paradise Fish 3"

Incompatible With

Neon Tetra 1.5" Cardinal Tetra 2" Rummy Nose Tetra 2" Ember Tetra 0.8" Black Skirt Tetra 2.5" Serpae Tetra 1.75" Congo Tetra 3.5" Glowlight Tetra 1.5" Harlequin Rasbora 2" Chili Rasbora 0.7" Celestial Pearl Danio 1" Zebra Danio 2"

Check Compatibility

Want to check if Common Goldfish is compatible with a specific fish? Use our compatibility checker to build your complete tank.