Emperor Shrimp


I am looking to buy Emperor Shrimp (Periclimenes imperator) but I cant find much info. on behavior, diet, and breeding. So if anyone knows anything, all help is appreicated.
I'm pretty sure all of them are commensal (sp) which means they live in/among larger creatures. I know some live in crinoids (impossible to keep) while others live in urchins (easier). Just make sure you know if the one your getting needs a host and if so, what its host is. Good luck.