How do you have a leopard wrass with crushed coral substrate? They like to bury themselves in the sand at night (or when threatened). How long have you had the leopard wrasse? If you haven't had it very long, and he isn't already accustomed to not having a sandbed to dive into, then definitely at least add a good amount of sand somewhere for your wrasse. They really do need 2-3" of sandbed, especially deeper as they get bigger. I agree with Jason, though that changing substrate isn't going to be an easy job.
Check out my video - the wrasse dives into the sand at the end. It's in my sig below.
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