Whoever recommended Filament barbs I could not agree more. I have a group of 7 in my 120. they are still small but they shoal quite tightly and get along well with everyone including cichlids.
Gourami`s are another good addition they tend to remain at the top water column, so clowns on the bottom, gourami or butterfly fish on the top. a group of something shoaling for the middle and then a few oddballs. thats the best way to have a tank with activity.
your little clowns look awesome btw