I have had one in my 90g for 1.5 years, and seems fine. He has not really grown much, but he is still kicking.
In January, I lost all my fish and a ton of corals due to a power outage, he survived it and I have no clue how since they are supposed to be super sensitive. I have not done much research about them on what they eat, but I know every time that I put a new frag or something in the tank, he is all over it. Must be going after sponges or something.
Chris