I have two urchins in my main display, one tuxedo, and one pincushion. My tuxedo roams around the tank, showing up usually in a new location every morning. My pincushion on the other hand always is in the same spot on one of my rocks. I can clearly see that the pincushion has been exploring and grazing on alge and coraline alge. Do others notice that their pincushion also has a “home” in their reef?