BeginnerSemi-AggressiveReef Safe

Lemon Damsel

Pomacentrus moluccensis

Family: Pomacentridae · Damselfish

Also known as: Lemon Damselfish, Molucca Damsel, Yellow Damselfish

Max Size

Min Tank

20 gal

Lifespan

5-8 years

Origin

Western Pacific, Indonesia

Diet

Omnivore

Swims

All

About

The Lemon Damsel is a vibrant, uniformly bright yellow damselfish that adds a splash of sunshine to any marine aquarium. Its intense lemon-yellow coloration covers the entire body and fins, making it one of the most visually appealing small reef fish available. Unlike many damselfish species that undergo dramatic color changes with maturity, the Lemon Damsel retains its brilliant yellow hue throughout its life, ensuring long-term visual appeal in the aquarium.

In the wild, Pomacentrus moluccensis is abundant throughout the Western Pacific, inhabiting coral-rich reef slopes and lagoons from Indonesia and the Philippines to the Great Barrier Reef and Fiji. It is typically found in close association with branching corals, particularly Acropora species, where it shelters among the branches and feeds on zooplankton and algae in the surrounding water column. Small groups or pairs are common, with each individual maintaining a small territory around its preferred coral head.

The Lemon Damsel falls into the semi-aggressive category of damselfish, making it more manageable than some of its more pugnacious relatives. While it will defend its territory against similar-sized fish, it is generally less confrontational than species like the Domino Damsel or Blue Devil. Its small adult size of around 3 inches, hardy constitution, and willingness to eat any offered food make it an excellent choice for beginner aquarists who want a colorful and active fish. It is completely reef-safe and can be kept in aquariums as small as 20 gallons.

Feeding & Diet

Omnivore

Lemon Damsels are omnivores that feed on zooplankton and filamentous algae in the wild. In captivity, they readily accept marine flakes, micro-pellets, frozen mysis shrimp, enriched brine shrimp, and cyclops. Include algae-based foods such as Spirulina flakes for balanced nutrition. These eager feeders rarely refuse any food offered. Feed small amounts two to three times daily.

Compatibility

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The Lemon Damsel is moderately territorial but less aggressive than many damselfish species. It coexists well with a variety of community fish including clownfish, tangs, wrasses, and other moderately assertive species. Avoid housing with very small or extremely timid species that may be intimidated. Multiple Lemon Damsels can be kept together in larger tanks with sufficient territory. Completely reef-safe with all corals and invertebrates.

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Breeding

Moderate

Lemon Damsels are substrate spawners that lay adhesive eggs on hard surfaces near their territory. The male prepares the nest and guards the eggs until hatching, which typically occurs within 3-4 days. Courtship involves the male performing rapid swimming displays to attract females. Larvae are tiny and pelagic, requiring rotifers and phytoplankton as first foods. Spawning occurs frequently in captivity.