Are they fairly small? It's hard to tell from the size of the pic ... could they be a small goby in the <a href="http://www.wetwebmedia.com/coryphopterus.htm">Coryphopterus</a> genus?
Impossible to ID from that pic. I've seen a Dottyback species with a similar coloration, but from your picture I can't tell if they're Dottybacks- or possibly a mimic.
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