Picasso Tiggerfish are lovely, but no recommended for beg.; can be aggressive, not suitable with smaller fish and on and on. You can get them later on! (It's recommended to get only one per tank.) Regal Tangs (Dora form Nemo) are also cute but can be aggressive. Yellow Tangs are fine and not aggressive.
I know that I didn't really help, but still, these are the fish that I would have loved to get if only I had a reef/fish only tank that's at least 3 times bigger than my 15g freshwater!
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