They are extremely long. 4-7 inches
Tan /white to brown coloration
Little "hairs" or legs on eah segment of body. Caught them crawling around some corals. Are they harmless. Or do I flush them?
When they are large enough to steal food from you crabs or brittle star. They gotta go. Lol I had one that was at least 6 inchs maybe larger. When it beat a large green brittle star in a tug of war for a silverside it was removed.