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Looks like a small pencil urchin to me too. I would say OK.


From what I hear they eat algae, and love to eat coraline algae. If your tank is acrylic, they can really scratch it up and you would want to remove it if you can. In a glass tank they are ok.


When it gets bigger, it may start picking up things and carrying them around on its top. If it picks up your frags, it will carry them to new areas of your tank and drop them. If this happens, give it a few small rocks or shells to carry instead, and take the frag away from it (like you would do to a small child).



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