Elacatinus sp.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/51035769981@N01">Franklin Samir Dattein</a> from Porto Alegre, Brazil
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/51035769981@N01/52855235/">Neon Goby</a>