Likely, but you wont stack them next to each other, so as long as you spread them out, you have a 55 so you have plenty of room.
Question as well, what lights you running?
Hahaha at least I got it right! Does it have individual reflectors? That fixture is definitely enough for any soft or LPS corals, if it has reflectors on it, it will be good for SPS corals as well later down the track but they will have to be placed medium to high in the tank!