Are Shortspine Urchins and Fromia stars ok in the same tank? I have a 55 gal. I've had the star and the urchin in the tank for about a week. Today I found the star on top of the urchin curled up not looking so good. I netted it and moved it to the sand and it's moving around currently crawling on up the glass. It now has some extra dangly bits hanging off one leg and out of the center. I'll attach a picture. Now I know the urchin didn't come after the starfish because he has been in the same spot all day, the starfish went to the urchin and ended on top of it. Will the starfish be ok? Is this going to be a constant problem? I searched and didn't find anything saying they couldn't be in the same tank.