I've kept one, the trick is to make sure that they are fed through transport, if they are when they arrive at your lfs they will eat. Mine ate brine but I soaked it in vitamins. It was also pick at the live rock and the seaweed selects. He would still be alive now if I didn't loose him and everyone else to a very long power outage. Now I have a generator so it isn't a problem anymore. But I'm going to try and keep 4 of them in my 450 when I get it, I plan to put a whole bunch of sponge and polyps into the tank to get the idol to eat. I think that I will have success with this plan. Best of luck to you in keeping one. They are SO hard