Emperor Angelfish

My 500g FOWLR aquarium (live rock, live sand, fake coral, CUC and all) is finally conditioned! I ordered an emperor angelfish juvenile, will be coming in a few weeks. While we wait, what fish would make some good tankmates? I know that they're peaceful w/dwarf angelfish but I'm good at keeping fish alive, not calculating their compatibility. Any suggestions?
Thanks,
FlameAngelfish:goldfish: