Admittedly I have only had the ORA Lytechinus variegates for a month or so, but I wanted to pass along my observations. Lytechinus variegates, native to warmer areas of the Atlantic and Caribbean Sea. ORA has been aqua-culturing this Urchin type since 2010. See below http://www.orafarm.com/blog/2011/02/27/our-first-new-species-for-2011/ Behaviors: It's been my experience that all of the pincushion type urchins are decorators. For some reason unknown to me my urchin will pick up my ORA Borealis Acro frag, and carry it around until I intervene. Gluing the frag down has proven fruitless, no other frag just the Borealis. The urchin will carry hermits and rocks around as well. Urchins are bulldozers and sometimes hazardous. My urchin recently removed the guard to my nanowave, not good. If you do not want to take the time to secure everything then an urchin is probably not worth it. The urchin was purchased from ORA for algae control, and has proven to be an effective tool against algae. Since purchase the urchin has done such a good job I must now supplement the urchin's diet with green seaweed strips. ^Urchin Eating Feedings are every 3-4 days. The urchin will eat for about 24 hours before moving on, usually consuming most of the algae sheet. Other than the occasional frag apparel problem and moving corals and rubble, the urchin is fairly benign giving the anemones a wide berth. As with other urchins and sensitive inverts water chemistry needs to be stable. I have noticed stress with past urchin when swings in pH and SG are present. My values SG: 1.025 Temp:78 Nitrates: 5 Phos: Undetectable Alk: 8 Ca:450-500 Mag:1500 If you're having algae issues think about an aqua-cultured urchin. Remember though you run the risk of getting stuck/stabbed if not careful when working in the tank. Urchins will move scape and corals if they are not secured. Water chemistry needs to be stable, and you might have to supplement the diet or re-home the urchin once the algae issues abates. Some urchins types do well feeding on coralline algae. A stressed urchin will have drooping spines as well as drop spines, intervention needs to be prompt as the condition is often unrecoverable in my experience.