If you are using RealReef rock or another colored rock they are great! Stay away from pencil urchins as they eat coral. The one bad thing with urchins in reef tanks is they LOVE to eat coralline algae. Sea urchins eat a variety of algae, mollusks, sponges, carrion, as well as starfish and sea urchins of smaller size. Coral predators are a natural part of a healthy coral reef ecosystem. - Some species can be venomous (long spine, obviously, but flower urchins sting via their tube feet) Tuxedo urchins are usually the best specimens, but the purple pincushion urchins are usually good too. Some representatives of this species are known for the power to catch and eat a mantis cancer. An 18-year study of Kenya's coral reefs has found that overfished reef systems have more sea urchins -- organisms that in turn eat coral algae that build tropical reef systems. Females of the species produce eggs. They have a rigid, usually spherical body bearing moveable spines, which gives the class the name Echinoidea (from the Greek ekhinos, spine). However, excessive densities of some corallivores, such as crown-of-thorns starfish (Acanthaster planci) and coral-eating snails (mainly Drupella spp. Urchins typically range in size from 3 to 10 cm (1 to 4 in), although the largest species can reach up to 36 cm (14 in). In Italy the season for sea urchins is mid November to the end of April. Some species of sea urchins live close to the shorelines where they are mostly out of the water. Sea urchin mainly eat marine vegetation like algae and kelp. Ways of eating sea urchins. Sea otters are another predator of urchins in the kelp forests. avoid food partners which overwhelm – sea urchins’ taste is delicate – scrambled eggs do well in this respect The crown-of-thorns sea star is a well- known predator of coral polyps. The creatures are also found in coral reefs because of the growing algae, which is a delicacy. Urchins can also have negative impacts on coral reefs. In some situations, where the processes of reef calcification may be depressed and/or urchin populations reach outbreak densities, the scraping effects of urchin feeding can remove coral recruits, reduce cover of important coralline algae ref and lead to unsustainable bio-erosion. Sea urchins typically inhabit deep waters only if there is wave action although some species are resistant to the action. Sea urchins, which live in sandy or soft ground, eat silt and sand, swallowing with it microscopic organisms. By signing up, you'll get thousands of step-by-step solutions to your homework questions. Answer to: What eats sea urchins in a coral reef? Between April 30 and June 30 the hunting of sea urchins is strictly regulated. Most release these eggs into the sea for fertilization by the sperm that males have released. 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