I have a psychedelic mandarin in my 62gal. and he continues to get fatter and bigger, so yes IME it can be done succesfully.
To increase your chance of success I would be patient and try to find one that will eat frozen food. When I got mine from my LFS I had them feed the tank some mysis shrimp and he was all over it. He continues to be a mysis pig in my display as well as constantly foraging the rock and sand for pods etc..
HTH and good luck they are a great fish, awesome colour and very entertaining
