Feather Dusters and Urchins
Feather Dusters range from very small inconspicuous specimens to relatively large ones that can extend over 8 inches across.Some live with their leathery tubes buried in the loose substrate. Other fan worms build small calcareous tubes attached to hard substrates.
Sea urchins or urchins are small, spiny, globular animals that compose part of class Echinoidea. They are found in oceans all over the world. Their shell, or "test", is round and spiny, typically from 3 to 10 cm across. Common colours include black and dull shades of green, olive, brown, purple, and red. They move slowly, feeding mostly on algae.