Pomacentrus alleni
| Identification | Brilliant royal blue body with a yellow tail — a vivid two-tone coloration that makes this small damsel stand out. Similar to the Yellowtail Blue Damsel but typically deeper blue. |
| Maximum Length | Up to 3 inches (7 cm) |
| Origin | Eastern Indian Ocean — Andaman Sea, Similan Islands |
| Minimum Tank Size | 30 gallons |
| Reef Compatibility | Yes |
Behavior
A bold, active damsel that claims a territory among the rockwork. Like most damsels, can be aggressive toward similar-looking fish but generally manageable in a reef tank with adequate space.
Diet & Feeding
Omnivore. In the wild feeds on algae and zooplankton. Accepts virtually all aquarium foods: flakes, pellets, frozen mysis, brine shrimp.