Fancy Goldfish (Carassius auratus) is a beginner-level freshwater fish that needs at least 30 gallons and 65-75°F. Round-bodied goldfish such as orandas, ranchus and fantails. Heavy waste producers that need big tanks and strong filtration, not bowls. See our goldfish vs. tropical fish guide for why they can't share with tropicals.
Care facts at a glance
| Scientific name | Carassius auratus |
|---|---|
| Family | Cyprinidae |
| Origin | Cultivated in East Asia |
| Adult size | 6-8 in |
| Minimum tank | 30 gallons |
| Temperature | 65-75°F |
| pH | 6.5-8.0 |
| Temperament | Peaceful |
| Social behavior | Groups |
| Swim level | All levels |
| Difficulty | Beginner |
| Diet | Omnivore: sinking goldfish pellets, veggies |
| Typical lifespan | 10-15+ years |
Quick tips
- Plan 30 gallons for the first fish plus 10-20 for each additional.
- Strong filtration and weekly water changes.
- Do not mix with tropical fish.
San Diego water
Tolerates San Diego's hard, alkaline tap water (pH roughly 7.6-8.6) with slow acclimation and a conditioner that handles chloramine. Learn the numbers in our San Diego tap water guide.
Before you buy
Make sure your tank is cycled (how to cycle a tank), check your numbers with the water testing guide, and use the compatibility guide to check tankmates. These are general ranges; individual fish and local water vary.
Find it at Pet Zone
Pet Zone Tropical Fish is a San Diego aquarium store with two locations. Stock changes daily, so call ahead if you are after a specific species or plant. Shop online at petzonesd.com.
4160 Convoy St, San Diego, CA 92111
(858) 987-0309
Open daily, 10am-6pm
Aquascaping, planted tanks
4266 University Ave, San Diego, CA 92105
(619) 283-1812
Closed Monday; Tue-Fri 10:30am-6pm, Sat 11am-6pm, Sun 11am-4pm
Monster fish, koi