Purple Reef Lobster Safe?

[4lti7ude]

I picked up a purple reef lobster from Ocean City yesterday. I was told it is reef safe and it was housed with sexy shrimp, Cleaners, and Boxers and they were all not being eaten.

Thing is I just read that they might still try to eat the fish in my tank.
Anyone ever keep a PRL before?

20Gallon Tall with lots of rock.
Clown Fish
Tail Spot Blenny
Blue Legged Hermit
Cleaner Shrimp? (Haven't seen him for a while since I added new rock)

These are the only fish in there with him. I only plan to pick up maybe 2-3 more small fish in the future.