If he's not eating your hammer coral yet, I'd say no Matt!
What size is it?
Mines going back to the LFS when I can catch him - destroyed a hammer coral in two days, never touched any softies in six months and still eats any foods offered.
My hammer coral died a while back, but it was because it was knocked of the rock by a turbo snail. It landed on its heads and didn't open up again. The RSCW is about 1.5".