Orbicular Cardinalfish

Found in small schools, during the day, around debris, mangroves, piers, and rocks, dispersing at night, foraging for food, over very shallow, sheltered shorelines.
They feed nocturnally on planktonic crustaceans.

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.