Can Green Terror Cichlid and Royal Gramma Live Together?

Green Terror Cichlid and Royal Gramma Compatibility Overview

Green Terror Cichlid and Royal Gramma are generally not recommended to be housed together. One of these is a marine species and the other is not; they cannot share one aquarium. The adult size gap creates a meaningful predation risk. Review the behavior and water details before deciding whether to attempt the pairing.

Compatibility factors for Green Terror Cichlid and Royal Gramma
Factor	Green Terror Cichlid	Royal Gramma	Verdict
Temperature	68–75°F	72–82°F	⚠️ 72–75°F (narrow)
pH Range	6.5–8.0	8.1–8.4	❌ No overlap
Temperament	aggressive	semi	❌ Risk
Adult Size	11.8 in	3.0 in	⚠️ 3.9× difference
Min. Group	1+	1+	See below
Min. Tank Size	100 gallons (for both species)		—

Compatibility Positives

A stable shared temperature range is available.

Incompatibility Reasons

One of these is a marine species and the other is not; they cannot share one aquarium.

The adult size gap creates a meaningful predation risk.

Their pH ranges do not meet: Green Terror Cichlid wants 6.5–8.0 and Royal Gramma wants 8.1–8.4.

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

Species Profiles

Green Terror Cichlid — Andinoacara rivulatus

Green Terror Cichlid and Royal Gramma 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

Royal Gramma — Gramma loreto

Green Terror Cichlid and Royal Gramma compatibility — Royal Gramma

The Royal Gramma, known for its vibrant blue coloration, is a popular saltwater fish among beginners and experienced aquarists alike. It requires a well-maintained tank with plenty of swimming space and a moderate current. With a peaceful temperament and a relatively easy care routine, the Royal Gramma can be a great addition to a community tank.

→ Full Royal Gramma care guide

Frequently Asked Questions

Can Green Terror Cichlid live with Royal Gramma?

Generally not recommended. Green Terror Cichlid and Royal Gramma are generally not recommended to be housed together. One of these is a marine species and the other is not; they cannot share one aquarium. 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 Green Terror Cichlid and Royal Gramma together?

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

What temperature suits both Green Terror Cichlid and Royal Gramma?

72–75°F (narrow) — inside Green Terror Cichlid's 68–75°F and Royal Gramma's 72–82°F.

Is a Green Terror Cichlid aggressive toward a Royal Gramma?

The adult size gap creates a meaningful predation risk.

Related Compatibility Guides

Tank Size for Green Terror Cichlid and Royal Gramma

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	180 gal	Best when keeping larger schools or reducing territorial pressure.

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