Big! Someone please come take this guy, he likes to eat my Xenia.....the body is about the size of a baseball & with spines about the size of a nerf football. Very cool Urchin, but I like my xenia more....
I think it is mainly an algea eater....I cant think of any reason why it would be a problem with an eel. I will require a big tank....he's fast and zips around the tank all the time....
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