Allen's Damsel

Pomacentrus alleni

(4 Reviews)

Allen's Damsel

Allen's Damsel

Pomacentrus alleni

(4 Reviews)

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Allen's Damsel Care Facts

Care Level: Easy
Temperament: Semi-aggressive
Diet: Omnivore
Reef Safe: Yes
Minimum Tank Size: 30 gallons
Max Size: 3 inches

Allen's Damsel, Pomacentrus alleni, is a small, iridescent, neon blue-colored damselfish with a lightning yellow underbelly. This fish has many other common names including Electric Blue Damsel, Yellow Belly Damsel, or just the Neon Damsel. The Allen's Damsel holds the namesake of Dr. Gerald Allen who is considered the world's preeminent scholar and researcher on damselfish. These fish are semi-aggressive, will eat most meaty and herbivore diets, need some amount of hiding places in at least a 20 gallon tank, and may become territorial with smaller fish, so it is best to monitor those relationships. Allen's Damsel is a very popular fish to house and is often considered a good fish for novice and expert hobbyists alike. 

Allen's Damsel (Pomacentrus alleni): An Informative Description for Saltwater Marine Aquariums

Habitat of the Allen's Damsel

From the Indo-Pacific region, Allen's Damsel is commonly found in coral-rich environments, often dwelling among branching corals and rocky outcrops.

is the Allen's Damsel Reef Safe?

Allen's Damsel is generally considered reef-safe as it does not pose a significant threat to corals or other invertebrates. However, it may be territorial, especially when establishing its own space within the tank.

How Big Does the Allen's Damsel Get?

With a size ranging from 3 to 4 inches (7.5 to 10 cm), Allen's Damsel is a small species suitable for various aquarium sizes.

How Long Does the Allen's Damsel Live?

Under proper care, Allen's Damsel can live for approximately 5 to 8 years, making it a long-lasting addition to your marine aquarium.

What To Feed the Allen's Damsel in Captivity

Allen's Damsel is omnivorous and requires a balanced diet that includes high-quality marine flakes, pellets, frozen mysis shrimp, and various marine algae to ensure its well-being.

Aquaculture Availability of the Allen's Damsel

Currently, aquacultured Allen's Damsel is limited in the hobbyist market. This species is more commonly captured from the wild.


Allen's Damsel is relatively peaceful and can coexist with various tank mates, especially those that share its active nature.

Allen's Damsel Personality

Known for its lively behavior, Allen's Damsel adds movement and activity to the aquarium. It may exhibit territorial tendencies, especially if introduced to the tank before other fish.

Suitable Tank Mates for Allen's Damsel

  • Firefish Goby (Nemateleotris magnifica): A non-aggressive species that adds movement and visual interest.
  • Banggai Cardinalfish (Pterapogon kauderni): Peaceful and occupies a different aquarium level.
  • Yellow Clown Goby (Gobiodon okinawae): A peaceful and colorful goby that complements Allen Damsel's temperament.
  • Royal Gramma (Gramma loreto): A striking and peaceful fish occupying a different tank niche.
  • Tailspot Blenny (Ecsenius stigmatura): A small, peaceful blenny that complements the active nature of Allen's Damsel.

It's important to note that the compatibility of tankmates can vary based on individual fish personalities, tank size, and the specific setup. Before introducing any new fish to your aquarium, thorough research and careful observation are essential to ensure the well-being of all inhabitants. Additionally, providing plenty of hiding spots, creating a diverse environment, and closely monitoring interactions can help reduce potential conflicts among tankmates.

Tank Requirements for the Allen's Damsel

Minimum Aquarium Size: A tank with a capacity of 30 gallons or more is suitable for housing Allen's Damsel.

Aquascaping: Provide ample hiding spots and crevices using live rock formations. This aids in reducing territorial conflicts.

Water Conditions for Allen's Damsel

  • pH: Maintain the pH level between 8.1 and 8.4.
  • Salinity: Keep the salinity within the range of 1.023 to 1.025.
  • Water Temperature: The recommended temperature range is 72°F to 78°F (22°C to 26°C).
  • Water Flow: A moderate water flow is preferred, simulating their natural environment.

Other Common Names for Allen's Damsel

Allen's Damsel might also be known as Allen's Damselfish or Neon Damselfish.

Why Choose Allen's Damsel from

Opting for Allen's Damsel from offers marine enthusiasts the opportunity to introduce a vibrant and active species to their saltwater marine aquarium. Our commitment to sourcing healthy and responsibly collected specimens ensures you receive robust and well-acclimated fish for your aquatic environment. With our extensive experience and dedication to marine life, is a reliable source for enthusiasts seeking quality marine species.

Overall, Allen's Damsel's vivid appearance and compatibility make it a dynamic addition to your saltwater marine aquarium. By adhering to their specific care requirements and providing an environment accommodating their active behavior, you can enjoy the energetic presence this colorful marine inhabitant brings to your tank.

Reviewed by: Brian Reynolds on Aug. 3, 2023

Reviewed by: Darryl Killingsworth on July 25, 2023

Gorgeous color-vivid blue! Love this addition to my tank. Price is good too.

Reviewed by: Esther Murphy on Oct. 7, 2017

Great little colorful damsels. Very hardy and great eaters!!

Reviewed by: Bill on Aug. 8, 2016

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