Blue Tang (Acanthurus coeruleus)

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Blue tang among grunts. We found that a surgeon is more fitting name; it is how we called this (family of) fish in Egypt. Note a yellow spot on its tail. It is a bony spine sharp enough to cause injury to the unwary. But despite its potential dangerousness, it is very popular in large marine aquariums. You can get one for about $30. 

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