Can Discus and Red Eye Tetra Live Together?

Discus and Red Eye Tetra Compatibility Overview

Discus and Red Eye Tetra are generally not recommended to be housed together. There is no shared temperature: Discus needs 82–88°F and Red Eye Tetra needs 72–79°F. Their pH ranges overlap only partly, so aim for the shared band and keep it steady. Review the behavior and water details before deciding whether to attempt the pairing.

Compatibility factors for Discus and Red Eye Tetra
Factor	Discus	Red Eye Tetra	Verdict
Temperature	82–88°F	72–79°F	❌ No overlap
pH Range	5.0–7.0	6.0–8.0	✅ 6.0–7.0
Temperament	semi	semi	⚠️ Monitor
Adult Size	8 in	2.8 in	⚠️ 2.9× difference
Min. Group	5+	6+	See below
Min. Tank Size	100 gallons (for both species)		—

Compatibility Positives

No specific synergy notes; compatibility is primarily water-parameter based.

Incompatibility Reasons

There is no shared temperature: Discus needs 82–88°F and Red Eye Tetra needs 72–79°F.

Their pH ranges overlap only partly, so aim for the shared band and keep it steady.

Both are semi, so give them a larger, well-planted tank and watch how they settle in.

Species Profiles

Discus — Symphysodon spp.

Discus and Red Eye Tetra compatibility — Discus

The 'king of the aquarium' — beautiful but demanding. Requires very warm, soft, acidic water that excludes most community fish.

→ Full Discus care guide

Red Eye Tetra — Moenkhausia sanctaefilomenae

Discus and Red Eye Tetra compatibility — Red Eye Tetra

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.

→ Full Red Eye Tetra care guide

Frequently Asked Questions

Can Discus live with Red Eye Tetra?

Generally not recommended. Discus and Red Eye Tetra are generally not recommended to be housed together. There is no shared temperature: Discus needs 82–88°F and Red Eye Tetra needs 72–79°F. Their pH ranges overlap only partly, so aim for the shared band and keep it steady. Review the behavior and water details before deciding whether to attempt the pairing.

What tank size do I need for Discus and Red Eye Tetra together?

A minimum of 100 gallons is recommended for keeping Discus and Red Eye Tetra together. A larger tank improves water stability and reduces territorial conflict.

What temperature suits both Discus and Red Eye Tetra?

There is no safe shared range: Discus needs 82–88°F and Red Eye Tetra needs 72–79°F.

Is a Discus aggressive toward a Red Eye Tetra?

Discus is semi and Red Eye Tetra is semi. No major aggression issues are expected between these species.

Related Compatibility Guides

Tank Size for Discus 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.

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