Chrysiptera allenii
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Allen’s Damsel is a striking yet often underrated member of the Chrysiptera genus, known for its vibrant coloration and compact, athletic body shape. Adults typically display a rich electric blue to bluish-purple body accented by bright yellow or gold on the face, dorsal area, or tail region, depending on lighting and mood. Like many damsels, their coloration intensifies under good water quality and proper diet. They are relatively small, usually reaching about 2.5–3 inches, making them suitable for a wide range of marine aquariums. Allen’s Damsels are alert, fast swimmers and spend much of their time darting in and out of rockwork, defending a chosen territory.
Allen’s Damsels are hardy and adaptable, making them an excellent choice for both newer and experienced marine hobbyists. A minimum tank size of around 20 gallons is recommended, though larger tanks (30+ gallons) significantly reduce territorial aggression. Live rock is essential, as it provides hiding spots, grazing surfaces, and clearly defined territories. These fish thrive in stable reef conditions with temperatures between 74–80°F, salinity around 1.024–1.026, and a pH of 8.1–8.4. They are reef-safe and will not harm corals or invertebrates. Compatibility is generally good with semi-aggressive fish, but they may bully timid tank mates or other damsels in smaller systems. Adding them later in the stocking order helps reduce aggression.
Allen’s Damsels are omnivores with a strong preference for meaty foods. In the wild, they feed on zooplankton, small crustaceans, and algae growing on reef surfaces. In captivity, they readily accept high-quality marine pellets and flakes, frozen foods such as mysis shrimp, brine shrimp, and finely chopped seafood. Supplementing their diet with spirulina-based foods or algae flakes helps support coloration and overall health. Feeding small portions once or twice daily is ideal, as they have fast metabolisms and are active throughout the day.