That's what they look like as adults. FWIW, I have never heard them called chromis, they are damsels. The Blue fin damsel is also known as the "black" damsel, because they turn black.
http://www.peteducation.com/article....articleid=2026
see also
http://www.wetwebmedia.com/ca/volume...Ugly_Swans.htm
Quote:
They start off mostly white with blue and yellow highlights, but turn to a drab black as they mature and approach their full adult size of seven inches
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