08-19-2013, 06:07 PM
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Bicolor would definitely get too big for your tank. Coral Beauty or Flame would be awesome additions, but be careful: they can nip at corals.
Clownfish are also in that "Chromis" family (they all fall under the "Pomancentridae" family: Chromis, Clowns and Damsels). Truth is, you take a fish that is used to an ocean and stick them in a small box of water, almost anything saltwater fish can get 'aggressive'. While damsels have the worst reputation, the Chromis and Clowns tend to be more aggressive towards their own. If you keep a pair in your tank, you should be fine...
I also like dottybacks for a fish that you could have in a 30...