Any aquarists on that can help me solve a dilema?

My problem is I have a Saltwater reef tank and I have a fish in there that has just become to big of a bully. He is a sergeant major damsel fish. He recently just killed my peacock flounder I had just purchased about a week ago. I have alot of live rock in there and my tank has been up and running for about a year and a half. I have corals that have settled on the rock. I need to get this fish out of there and the old “scoop and grab” with a net is not working he is way to smart for that. I really do not want to remove all the rock as it may disturb the balance I have created in the tank. Has anyone ever had to get a fish out of the tank and made any sort of trap that has been successful? Any ideas, tips, or tricks would be appreciated. He literally runs the tank and is just to big of a pain not to mention costing me wasted money keeping him.

A little info on the fish in question..he is about 3 inches in length with a fairly rounded body to match.