Bristlenose catfish <i>Ancistrus</i> sp. are commonly used as cleaner fish in small warm freshwater aquaria.
<a href="//commons.wikimedia.org/wiki/User:Tintazul" title="User:Tintazul">Júlio Reis</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>