First of all, Welcome to the wonderful forum. Here you will get lot of help and info regarding this hobby.
I can only say that mine did not last long I think my shrimp got ahold of him. It was a green one, they are so cute and I think they would do alot better in a nano tank with some sexy shrimps that are also very tiny.
Some say they are not easy to get to eat, but I never had the chance for that to happen.
My lfs recommends them in groups, but better wait till you get some replies here from folks that have them.
I would certainly get one again now that I have a very tiny pico tank.
What type of tank, fish, corals do you currently have??
Again, welcome......