Ad blocker interference detected!
Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers
Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.
A type of animal which form colonies underwater. They build up rocky deposits to fasten themselves in place and create currents through tunnels through the mass. Food particles in the currents are absorbed.