Well i dont know.... The guy at the LFS gave me a tile star (you can see it in that pic) to feed em cause he didnt had chocolate chip stars or feeder stars. I put it in at the same time as the shrimp. 3 days later (today that is) i woke up to find the star COPLETELY destroyed and the shrimp eating its remains. They seemed to lose interest in the dead star so I left in the 2 legs that seemed to still have meat in them and removed the body... Maybe these got hungry during shipping but i really hope they dont go thru a star every 3 days heheh. ANd yes, very reef safe, but if stuff gets close to them they will defend themselves!