Can Black Neon Tetra and Lionfish Live Together?

Black Neon Tetra and Lionfish Compatibility Overview

Black Neon Tetra and Lionfish 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 Black Neon Tetra and Lionfish
Factor	Black Neon Tetra	Lionfish	Verdict
Temperature	68–82°F	72–82°F	✅ 72–82°F
pH Range	5.0–7.5	8.1–8.4	❌ No overlap
Temperament	peaceful	aggressive	❌ Risk
Adult Size	1.4 in	15.0 in	❌ 11× difference
Min. Group	8+	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: Black Neon Tetra wants 5.0–7.5 and Lionfish wants 8.1–8.4.

Black Neon Tetra is peaceful and Lionfish is aggressive. Expect chasing and fin damage unless the tank is oversized, heavily planted, and watched closely.

Species Profiles

Black Neon Tetra — Hyphessobrycon herbertaxelrodi

Black Neon Tetra and Lionfish compatibility — Black Neon Tetra

The Black Neon Tetra is a popular freshwater species known for its vibrant colors and peaceful temperament. It is an excellent addition to community tanks, thriving in groups of 6 or more. These tetras require a well-maintained aquarium with a flowing current and plenty of swimming space. With proper care, they can live up to 5 years.

→ Full Black Neon Tetra care guide

Lionfish — Pterois volitans

Black Neon Tetra and Lionfish compatibility — Lionfish

Lionfish are popular saltwater aquarium fish known for their striking colors and intimidating spines. These fish require a large tank and careful attention to water parameters. Aggressive by nature, they can be harmful to smaller fish and invertebrates.

→ Full Lionfish care guide

Frequently Asked Questions

Can Black Neon Tetra live with Lionfish?

Generally not recommended. Black Neon Tetra and Lionfish 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 Black Neon Tetra and Lionfish together?

A minimum of 100 gallons is recommended for keeping Black Neon Tetra and Lionfish together. A larger tank improves water stability and reduces territorial conflict.

What temperature suits both Black Neon Tetra and Lionfish?

72–82°F — inside Black Neon Tetra's 68–82°F and Lionfish's 72–82°F.

Is a Black Neon Tetra aggressive toward a Lionfish?

The adult size gap creates a meaningful predation risk.

Related Compatibility Guides

Tank Size for Black Neon Tetra and Lionfish

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

Scenario	Tank	When it applies
Minimum viable	120 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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