Cirrhilabrus isosceles
| Identification | Male: vivid red to orange-red body with blue highlights and a strikingly tall, sail-like dorsal fin — one of the most dramatic dorsal fin displays among Cirrhilabrus. |
| Maximum Length | Up to 4 inches (10 cm) |
| Origin | Western Pacific — Japan, Ryukyu Islands |
| Minimum Tank Size | 55 gallons |
| Reef Compatibility | Yes |
Behavior
Prized for its spectacular sailfin dorsal display. Males erect the tall dorsal fin when courting or displaying to rivals. Peaceful, active, and hardy once established.
Diet & Feeding
Carnivore. Offer frozen mysis, copepods, and enriched frozen foods.