Sphaeramia orbicularis

Sphaeramia orbicularis, commonly known as the Orbiculate cardinalfish, is the far less known cousin of S. nematoptera. At first glance it can be mistaken, but S. orbicularis has a more mottled pattern and is mostly brown on a cream to beige body.

They're best kept as a couple unless you have a very large tank, in that case you can add a group.