Swelling Coral

About

Swelling coral (Leptoseris incrustans) is a quietly distinctive stony coral found across the Indo-Pacific, growing on shallow reef structures typically between 10 and 25 meters depth. Rather than building dramatic structures, colonies spread outward as flat, encrusting sheets that occasionally develop broad, plate-like extensions. These plates are marked by subtle radiating ridges that give the surface a layered, almost architectural look up close. The individual corallites are small and tightly packed, sitting just above the skeleton surface rather than projecting outward, which contributes to the smooth, porcelain-like texture that earns it one of its alternate common names. The coenosteum develops small bumpy projections reminiscent of Hydnophora, adding a bit of texture between the corallites. Coloration runs from pale tan through various shades of brown to a muted greenish-brown, nothing flashy but genuinely attractive in the right tank. In the aquarium, this species is an accessible choice for hobbyists who don't have a high-output lighting system, as it naturally occupies lower-light zones on the reef. Combined with its preference for gentle water movement, it fits well in mixed reef tanks where you need a tough, undemanding SPS to fill in shaded or lower areas of the rockwork.