My Urchin died yesterday, I called my LFS man to make sure he wasn't just molting, lol, Thats funny if you have been reading my post on my molting shrimp getting caught in my power head, anyway, he told me that he was in fact, dead. I have to thoughts as to why he died, and their both most likely wrong. I am guessing that they eat algae, and I have very little algae, if any in my tank, the cleaning crew does a good job and I do my 15 to 20g water changes every week. The second reason, I have two vegi clips in my tank, in the morning I put Romain lettuce on one clip and the other I put R. lettuce and a piece of seaweed in front of it on the same clip. The Urchin was eating alot of the lettuce I am sure, and that may not have sit well with him. I take the lettuce out when I get home from work and switch to the seaweed, I use the lettuce so the fish will have something to munch on all day, the seaweed will fall apart in an hour or two. What do ya'll think, any thoughts ?