Watcher: I agree on your choice of fish. The problem is, that's exactly what he has eaten. A few tangs and a grouper!
I've been trying to add a little color to the tank, and its really become a trial and error thing. So far he has eaten, a marine Betta (the biggest one I have ever seen), two large yellow tangs, and a large cinnamon clown. He doesn't seem to have a taste for wrasse, or damsels. Probably doesn't eat the damsels because they're not worth his time to catch. I'm trying to find a really big grouper now, but worry they are not fast enough.