I have a hitchiker urchin. He is now about dime size. I think he is a pencil urchin, but I cant be sure. He is pure black. I am noticing my coralline is being chewed off in tiny sections, and now I see a spot on a zoa rock that is missing coralline (was previously there) and possibly even eate some zoa heads. I am not sure if they were eaten, or just reallly ticked off and closed now.
Have urchins been known to damage zoas?
Have urchins been known to damage zoas?