depending on your filtration you would be able to add a few more. I have a volitan lion,picasso,lunar wrasse,3 damsels,snowflake and crowned pearl-scale butterfly and they have been doing well in my 72 bowfront. but I am getting ready to get a bigger tank to try and house some larger fishes. I say in your case maybe 1 or 2 more would be fine.
Good luck and welcome to the hobby.