Corky Sea Finger

About

Corky sea finger (Briareum asbestinum) is one of those soft corals that makes a reef tank feel genuinely alive. Native to the Western Atlantic, it grows throughout the Caribbean and surrounding tropical waters, where it can be found from the shallows right down to around 55 meters. In the wild it takes the form of thick, rubbery columns or encrusting mats, usually a grayish-brown when the polyps are retracted, but transforming into a soft purple or lavender carpet when those tiny polyps fully extend. That contrast between the two states is one of its more appealing qualities. A closed colony looks almost inert, then opens up and becomes a completely different animal. In the aquarium it tends to be forgiving, making it a reasonable choice for hobbyists who are newer to keeping soft corals. It adapts well to moderate light and flow, and it does not have the demanding chemistry requirements that many stony corals require. One thing worth knowing is that it can spread over time, encrusting nearby rock and even the bases of other corals, so give it space and keep an eye on its neighbors. Reef safe and generally peaceful, it rewards minimal fuss with steady, attractive growth.