Umbrella Corallimorph

About

The umbrella corallimorph (Discosoma neglecta) is a soft, fleshy cnidarian that looks like a flattened disc or open mushroom cap attached to a rock. It belongs to the corallimorpharia, a group that sits somewhere between true corals and sea anemones. Sharing traits with both but calcifying like neither. In the wild it's found across the Western Atlantic, including the Gulf of Mexico and waters off Colombia, typically in lower-light zones where it colonizes hard substrate in relaxed, low-flow conditions. Colors vary but tend toward muted greens, grays, and browns, often with subtle surface texture. In the aquarium, this is about as beginner-friendly as reef inhabitants come. It tolerates a wide range of conditions and asks for little in return. Dim lighting suits it just fine, and strong flow will actually irritate it, causing it to stay contracted. Given stable water quality and a spot out of direct, intense light, it will spread gradually by cloning itself, so a single polyp can eventually become a small colony. It's reef safe and gets along with most tankmates as long as nothing is crowding its personal space. For newer saltwater keepers looking to dip into corallimorphs, this is a genuinely forgiving place to start.