I had a Bimac for a little while. The bimacs are most common and seem to do better then most in captivity. However none of them live very long.
Here is a cool site
www.tonmo.com, lots of info there.
Would I do it again? No. They really should be left in the ocean. They are very illusive and hide most of the time. It is awesome to watch them eat though. I had mine taking frozen shrimp from a feeder stick. It was really neat to feed him. Most times he would grab the food, wrap it up and then spend the next 20 minutes playing my me and the stick. I was neat but some mornings I didn't have time to play. LOL
The enclosure isn't too bad to build. The lid is the toughest part. I used nylon screen to secure any areas of concern. Works like a charm.