This is a larger cluster of red colonial worms (not like the small one in the picture). The cluster is about 2 inches in diameter, and will have bright red worms on it. Each worm is about 1/8 to 1/4 inch in diameter. The worms will need to be fed planktonic foods, similar to what you would feed a coral or zoanthid. The worms live in calcareous tubes which they secrete as they grow and multiply. We have a very limited quantity of these clusters.