So ive had a long spine urchin in my tank for 7 months now. Today when the lights come on i notice white spots where Zoas used to reside. I look closed and see the actual teeth scrapings marked on the rock. What the????? i look to the left and sure nuff here the urching munching on my mean greens.:ah: WT@???oh: Never went for corals before now its his feeding ground. Please convince me not to throw him outside LOL. (i wont) but its definately taking a trip to LFS. finally got the mean greens to expand and now have none . So bummed. GUess i need to find anothere resident to control algea growth now.