A good dither fish might be a cardinal? they swim in open water, and shouldn't be aggressive if there is only one.
An Azure Damsel could also work (bule damsel with yellow belly, not the the yellow tailed ones) I have found these to be the only non-aggressive damsels, but might act differently in small systems.
Other then that maybe a chromis (bicolour or blackbar tend to accept a little less swimming room then typical greens, and are more related to damsels when it comes to eating. Greens tend to want to be fed like anthias, which may be difficult in small systems.
I think an anemone would be a good bet once they adopt it, it would stop the clowns from hovering in top corner of the tank together (I don't know why but they always seem to do that instead of finding a home in the rocks) it will give them some more room away from the surface when they do their thing.
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