These are Passer Angelfish (<i>Holocanthus passer</i>) and they were photographed on a morning dive at Czech Point dive site in the waters of Coiba National Park, Panama.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/40467171@N00">LASZLO ILYES</a> from Cleveland, Ohio, USA
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/laszlo-photo/2067198665/in/set-72157603268049244/">School Colors</a>