Pencil Urchins Reef safe?

That's the biologists way of saying inverts that don't move. So that would include corals, sponges, tube worms and host of others ;)
 
Any urchin is a bad idea they tend to knock over corals and cause problems. Sorry they are neat. There are some like the tuxedo urchin that eat only algae, but they can be troublesome with knocking over corals.
 

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