PisciDex Species Profile
Ranchu Goldfish
High-grade dorsal-less fancy goldfish prized in Japanese keeping traditions, requiring gentle flow, excellent filtration, and smooth decor.
Carassius auratus
Cyprinidae | Domestic | Japanese fancy goldfish strain
Core Requirements
Tank Size
30 gallons minimum
Adult Size
8 inches
Group Size
Solo
Bioload
6/10
Water Parameters
Temperature
65-75 F
pH
7-8
Plant Safe
No
Invert Safe
No
Data Confidence
medium
Temperature note: Recommended and tolerated temperature ranges currently match the primary care profile.
Care Warnings
- Slow fancy goldfish; avoid fast, nippy, or tropical tankmates.
Behavior & Husbandry
Temperament
Peaceful
Aggression
1/10
Diet
Omnivore
Difficulty
Advanced
Lifespan
10 years
Breeding
Advanced
Schooling
No
Compatibility Tags
PeacefulSolitaryMid WaterHardwater
Similar Species
Species Compatibility
Database-driven compatibility notes for planning community aquariums.