Goldfish and Red Eye Tetra Compatibility Overview
Goldfish and Red Eye Tetra are generally not recommended to be housed together. Goldfish is a cool-water fish and Red Eye Tetra is tropical, so the usable temperature range decides this pairing. The adult size gap creates a meaningful predation risk. Review the behavior and water details before deciding whether to attempt the pairing.
| Factor | Goldfish | Red Eye Tetra | Verdict |
|---|---|---|---|
| Temperature | 50โ74ยฐF | 72โ79ยฐF | โ ๏ธ 72โ74ยฐF (narrow) |
| pH Range | 6.5โ8.0 | 6.0โ8.0 | โ 6.5โ8.0 |
| Temperament | peaceful | semi | โ ๏ธ Monitor |
| Adult Size | 12 in | 2.8 in | โ 4ร difference |
| Min. Group | 1+ | 6+ | See below |
| Min. Tank Size | 100 gallons (for both species) | โ | |
Compatibility Positives
Incompatibility Reasons
Species Profiles
Goldfish โ Carassius auratus
Classic pond and aquarium fish that prefer cool water. Heavy waste producers that require robust filtration. Will eat small fish and shrimp.
Red Eye Tetra โ Moenkhausia sanctaefilomenae
The Red Eye Tetra is a popular freshwater fish known for its vibrant red eyes and sleek, silver body. They are generally peaceful and can be kept in a community tank with other non-aggressive species. Their moderate activity level makes them suitable for a variety of aquarium setups. With proper care, they can live up to 5 years.
Frequently Asked Questions
Can Goldfish live with Red Eye Tetra?
Generally not recommended. Goldfish and Red Eye Tetra are generally not recommended to be housed together. Goldfish is a cool-water fish and Red Eye Tetra is tropical, so the usable temperature range decides this pairing. The adult size gap creates a meaningful predation risk. Review the behavior and water details before deciding whether to attempt the pairing.
What tank size do I need for Goldfish and Red Eye Tetra together?
A minimum of 100 gallons is recommended for keeping Goldfish and Red Eye Tetra together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Goldfish and Red Eye Tetra?
72โ74ยฐF (narrow) โ inside Goldfish's 50โ74ยฐF and Red Eye Tetra's 72โ79ยฐF.
Is a Goldfish aggressive toward a Red Eye Tetra?
The adult size gap creates a meaningful predation risk.
Related Compatibility Guides
Tank Size for Goldfish and Red Eye Tetra
Use the scenario that matches the actual group sizes and temperament you plan to keep.
| Scenario | Tank | When it applies |
|---|---|---|
| Minimum viable | 100 gal | Only for the recommended minimum groups, mature filtration, and close monitoring. |
| Recommended community | 150 gal | Adds territory, swimming room, and a safer buffer for behavior. |
| Low-conflict setup | 220 gal | Best when keeping larger schools or reducing territorial pressure. |