stocking suggestion for 55gal

I have a 55gal (4ft long) with plenty of live rock, sand, protein skimmer, filter and powerheads



Currently housed:

2 ocellaris clowns (introduced about a month ago)

2 pj cardinals (just bought them, currently in quarintine)



Plan to get:

1 diamond sleeper goby or golden head sleeper goby

1 angelfish - I like Flame or Coral Beauty if my tank is big enough?

1 tang - again, whatever my tank will hold, if anything???



I'm open to suggestions for the rest, especially if some of what I was going to get won't fit



Thanks for the help!