Sawcheek Cardinalfish

Found singly, pairs, or in small schools, during the day in caves, coral holes, and in tubular sponges, dispersing at night, foraging for food over the reef.
They feed nocturnally on zooplankton.

Males incubate their eggs inside their mouths, as the egg masses increase in size they can be found with wide open mouths where they shift the eggs around to aerate the egg masses.