Green Terror Cichlid and Harlequin Rasbora Compatibility

Green Terror Cichlid and Harlequin Rasbora Compatibility Overview

Green Terror Cichlid and Harlequin Rasbora are generally not recommended to be housed together. The adult size gap creates a meaningful predation risk. 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 Green Terror Cichlid and Harlequin Rasbora
Factor	Green Terror Cichlid	Harlequin Rasbora	Verdict
Temperature	68–75°F	72–81°F	⚠️ 72–75°F (narrow)
pH Range	6.5–8.0	5.5–7.5	✅ 6.5–7.5
Temperament	aggressive	peaceful	❌ Risk
Adult Size	11.8 in	1.75 in	❌ 7× difference
Min. Group	1+	8+	See below
Min. Tank Size	100 gallons (for both species)		—

Compatibility Positives

A stable shared temperature range is available.

Incompatibility Reasons

The adult size gap creates a meaningful predation risk.

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

Green Terror Cichlid is aggressive and Harlequin Rasbora is peaceful. 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 Harlequin Rasbora 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

Harlequin Rasbora — Trigonostigma heteromorpha

Green Terror Cichlid and Harlequin Rasbora compatibility — Harlequin Rasbora

Active mid-level schooling fish with a distinctive black triangular patch. One of the best all-around community tank fish.

→ Full Harlequin Rasbora care guide

Frequently Asked Questions

Can Green Terror Cichlid live with Harlequin Rasbora?

Generally not recommended. Green Terror Cichlid and Harlequin Rasbora are generally not recommended to be housed together. The adult size gap creates a meaningful predation risk. 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 Green Terror Cichlid and Harlequin Rasbora together?

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

What temperature suits both Green Terror Cichlid and Harlequin Rasbora?

72–75°F (narrow) — inside Green Terror Cichlid's 68–75°F and Harlequin Rasbora's 72–81°F.

Is a Green Terror Cichlid aggressive toward a Harlequin Rasbora?

The adult size gap creates a meaningful predation risk.

Related Compatibility Guides

Tank Size for Green Terror Cichlid and Harlequin Rasbora

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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