Urchin, starfish, or both in same tank?

[ajtomase]

I've heard that pincushion and tuxedo urchins will starfish. Has anyone experienced that, or is it safe to keep both in the tank at the same time?

 

[Auquanut]

Never had an issue with my urchins bothering starfish, but I could never keep stars alive long term. They can be hard to keep. I have a tuxedo and a pincushion. They can be real bulldozers, but are great algae grazers.