Right now I have two firefish (magnifica) which are doing wonderful! They are always together. They were purchased at the same time, from the same tank at the LFS. I also have a coral beauty in the tank with them. (38g tank). They all live in the same hole in the same rock! I used to have a bar goby who lived with them too, but he's gone now.
![Frown :( :(](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
When I first started the tank, I had just one firefish who did great....until a more agressive fish tore him up so badly that he died. It took about 2 weeks for the firefish to come out and really show there true personalities. I love them and would recommend keeping them in pairs. They are a wonderful addition to any tank as long as it doesn't get done in by a more agressive tank mate.