I liked the look of pin cushion urchins but my friends dad got sent to the hospital because he got impaled by a sea urchinSome species of asterina (or whatever people are calling asterinas) eat zoanthids, some won't touch corals unless starving. The pesky ones tend to be a bit larger, darker colored, and splotchy. Either way, they're the only star-shaped starfish suitable for a reef tank.
How do you feel about tuxedo urchins? I know they aren't starfish, but they're echinoderms, which are the same group. They're pretty cool.
Great they sound like the perfect fit I will get one of those and do some more research on themTuxedo urchins are about as sharp as a hairbrush. You can safely pick them up. As for compatibility, they have absolutely no interest in anything that isn't algae or a small item they can wear. Their single potential compatibility issue (aside from big fish that might eat them) is that they carry small things around for protection and camouflage, and may pick up small coral frags, hermit crabs, or snails. Nothing eats them, at least nothing you would be likely to have in your tank, because they're sea urchins.