White Encrusting Zoanthid

About

The white encrusting zoanthid (Palythoa caribaeorum) is a colonial soft coral native to the Western Atlantic, where it spreads across rocky and reef surfaces in shallow tropical waters. Rather than building upward like stony corals, it grows outward in a low, mat-like sheet, with individual polyps embedded in a shared rubbery tissue that can blanket surprisingly large areas of substrate. The coloration tends toward muted tans and browns, occasionally with pale or greenish centers depending on the light environment and the zooxanthellae the colony hosts. In the aquarium, this is a forgiving choice for newer reef keepers. It adapts well to moderate lighting and moderate flow, and its encrusting growth habit makes it a natural fit for filling in the lower rock work of a display. Like all palythoans, it does contain palytoxin in its tissues, so handling with gloves and avoiding contact with broken tissue or tank water during fragging is genuinely important. This is not a scare tactic, just standard practice any experienced reefer will tell you. Beyond that safety note, it is a low-demand coral that rewards consistent basic care with steady, outward expansion across the rockscape.