I had one for a little while. IMO once the novelty wears off, they're kind of boring. They look cool while swimming but most of the time they hide under your rock work with just their heads out waiting for food. They have horrible sight and a great sense of smell, so they will eat anything that moves near them. Mine was in my 55 when I first started. He was always shaking to burrow out caves in the sand which would be all over rocks and corals. Then one day I was feeding him in front of my son and he ate nemo. Bad Times!! I would say either reef tank or predator tank.