Also what fishes would be good for this setup?
A 55 gives you around 11" of fish using the 1"/5g rule. That does not mean a 10" fish should be in there, though. I'd say you'll probably want to get fishes that will not exceed 5-6 in. fully grown, anything larger will stress the fish and cause problems or need a new tank. Damsels, gobies, jawfish, blennies, Clownfish, are good to name a few. Then possibly a dwarf angel maybe are possible when the tank is several months old. Here, check this site it gives the min. tank size for each fish...