Chagos Brain Coral

About

Chagos Brain Coral (Ctenella chagius) is a genuinely uncommon brain coral that doesn't get nearly the attention it deserves in reef circles. Found on reef slopes in the Indo-Pacific, it forms submassive colonies with a distinctly meandroid structure. Meaning the surface is carved into long, winding valleys rather than individual polyp mouths, giving it that classic brain coral topography taken to a particularly convoluted extreme. The septo-costae, the thin blade-like structures running between the valleys, grow in two somewhat blurred orders and tend to fuse at oblique angles along the tops of the walls rather than meeting cleanly, creating a subtle ridged texture that sets this species apart from other brain corals if you look closely. Coloration tends toward the understated side: cream, soft green, and light brown are typical, so this isn't a coral that shouts from across the room, but up close the structural detail is genuinely interesting. In the aquarium, Ctenella chagius is considered an intermediate-level coral, doing best under moderate lighting and moderate flow conditions. It's not a beginner's first LPS pick, but a reef keeper who's comfortable with stable water quality and patient acclimation should find it a rewarding and unusual centerpiece.