They are said to do very poorly. I have a juvenile I got a few months ago, it is doing great. I don't know if that will translate into adulthood, but it eats everything, including Ocean Nutrition angel formula with sponge. Sponges are supposed to be very important in the diet. I posted a while ago about them, and had a few people say they kept them long term. I would get a subadult, between 2 and 4 inches, and make sure you can see it eat and inspect for any problems. Make sure you have an established tank with plenty of live rock, hopefully with some sponges growing.