Can Fire Eel and Green Terror Cichlid Live Together?

Fire Eel and Green Terror Cichlid Compatibility Overview

Fire Eel and Green Terror Cichlid are generally not recommended to be housed together. The adult size gap creates a meaningful predation risk. Their ranges meet only at 75–75°F, which leaves no margin for a heater drifting or a warm room. Review the behavior and water details before deciding whether to attempt the pairing.

Compatibility factors for Fire Eel and Green Terror Cichlid
Factor	Fire Eel	Green Terror Cichlid	Verdict
Temperature	75–82°F	68–75°F	⚠️ 75–75°F (narrow)
pH Range	6.0–7.0	6.5–8.0	⚠️ 6.5–7.0 (narrow)
Temperament	semi	aggressive	❌ Risk
Adult Size	39.4 in	11.8 in	⚠️ 3.3× difference
Min. Group	1+	1+	See below
Min. Tank Size	100 gallons (for both species)		—

Compatibility Positives

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

Incompatibility Reasons

The adult size gap creates a meaningful predation risk.

Their ranges meet only at 75–75°F, which leaves no margin for a heater drifting or a warm room.

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

Fire Eel is semi and Green Terror Cichlid is aggressive. Expect chasing and fin damage unless the tank is oversized, heavily planted, and watched closely.

Species Profiles

Fire Eel — Mastacembelus erythrotaenia

Fire Eel and Green Terror Cichlid compatibility — Fire Eel

The Fire Eel is a stunning, red-bottomed species that requires a spacious tank. They are peaceful bottom feeders and do best in a well-planted, mature aquarium. With a moderate activity level, they can be a great addition to a community tank, but their size and diet may be incompatible with smaller fish.

→ Full Fire Eel care guide

Green Terror Cichlid — Andinoacara rivulatus

Fire Eel and Green Terror Cichlid compatibility — Green Terror Cichlid

The Green Terror Cichlid is a popular choice for experienced aquarists due to its striking appearance and vibrant colors. They are known for their aggression and should be kept in a species-specific tank. Their tall, laterally compressed bodies and vivid coloration make them visually appealing but require careful handling due to their potentially aggressive…

→ Full Green Terror Cichlid care guide

Frequently Asked Questions

Can Fire Eel live with Green Terror Cichlid?

Generally not recommended. Fire Eel and Green Terror Cichlid are generally not recommended to be housed together. The adult size gap creates a meaningful predation risk. Their ranges meet only at 75–75°F, which leaves no margin for a heater drifting or a warm room. Review the behavior and water details before deciding whether to attempt the pairing.

What tank size do I need for Fire Eel and Green Terror Cichlid together?

A minimum of 100 gallons is recommended for keeping Fire Eel and Green Terror Cichlid together. A larger tank improves water stability and reduces territorial conflict.

What temperature suits both Fire Eel and Green Terror Cichlid?

75–75°F (narrow) — inside Fire Eel's 75–82°F and Green Terror Cichlid's 68–75°F.

Is a Fire Eel aggressive toward a Green Terror Cichlid?

The adult size gap creates a meaningful predation risk.

Related Compatibility Guides

Tank Size for Fire Eel and Green Terror Cichlid

Use the scenario that matches the actual group sizes and temperament you plan to keep.

Scenario	Tank	When it applies
Minimum viable	114 gal	Only for the recommended minimum groups, mature filtration, and close monitoring.
Recommended community	180 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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