mulitple wrasses?
 

I just got a fine spotted fairy wrasse. Can I add other wrasses? If so, what kind?

In a 55 I would say 2 if you added them at the same time but the C. Punctatus is one of the more aggressive wrasses out there if you have to try get one bigger and make sure the cover on the tank has no escape holes or you'll have a nice wrasse mummy on the floor. My advice would be to try something else.