Can goldfish live with otocinclus?
❌ Not recommended No, it's not recommended
- ❌ Not recommended An adult fancy goldfish (up to 20 cm) is big enough to eat otocinclus (4 cm).
- ⚠️ Caution Goldfish are coldwater fish that produce a lot of waste; they are usually kept only with other goldfish.
| Fancy goldfish | Otocinclus | |
| Temperature | 68–73 °F (20–23 °C) | 70–79 °F (21–26 °C) |
| pH | 7–8 | 5.5–7.5 |
| Adult size | 7.9 in (20 cm) | 1.6 in (4 cm) |
| Temperament | Peaceful | Peaceful |
| Swims in | All levels | Bottom |
| Minimum tank | 20 gal | 10 gal |
Shared temperature: 70–73 °F (21–23 °C) · Shared pH: 7–7.5
If you already have both
- Separate them as soon as possible, or rehome one of them. Use a divider in the meantime.
See all fancy goldfish tank mates and otocinclus tank mates, or add more species in the checker.
FAQ
Can goldfish live with otocinclus?
No, it's not recommended. An adult fancy goldfish (up to 20 cm) is big enough to eat otocinclus (4 cm). Goldfish are coldwater fish that produce a lot of waste; they are usually kept only with other goldfish.
What temperature for goldfish and otocinclus?
Fancy goldfish: 68–73 °F (20–23 °C). Otocinclus: 70–79 °F (21–26 °C). Shared range: 70–73 °F (21–23 °C).
What size tank for goldfish and otocinclus?
At least 20 US gallons, more as you add fish.
Note: Compatibility depends on individual temperament, tank size, decor and how fish are introduced. Our verdicts use conservative rules applied to published care data (see methodology). They are guidance, not a guarantee. Quarantine new fish and watch for chasing, torn fins or hiding.