Pictured in the latest installment of the AquaNerd Picture of the Week is a popular reef fish, the Squarespot Anthias (Pseudanthias pleurotaenia). While swimming in the large display reef at Fish Gallery’s Houston store among larger fish, this fish passively rules the tank. It’s not a small fish by any means, and it’s display can be quite intimidating when fins start flaring. Fortunately, the squarespot isn’t aggressive toward other fish, except for the occasional squabble with conspecifics. Like most anthias, this normally peaceful species does well in groups containing a single male and a harem of females. The females don’t have the square markings on their body, so it’s easy to tell them apart from males.