This is what I learned from keeping one alive for about three weeks.
They need a lot of swimming room.
They MUST be the biggest fish in the tank with little competition for food. They do eat, but tend to be really slow eaters, which is why they end up starving to death.
They seem to have a FAST metabolism and use up the food they eat fast, so they need to be fed often. I fed twice a day and that might be sufficient if there was no competition for food.
They are not aggressive toward other tankmates, but cannot be trusted with corals, they do eat LPS corals.
It would be a neat experiment for someone running a FOWLR tank with only smaller fish to try one and see if they have better success. I will try one again in the future, but only when I have a fourth tank
-Doc