Description

Also known as Fiveband Cardinalfish, Fiveline Cardinal, Fiveline Cardinalfish, Five-lined Cardinal, Five-striped Apogon, Five-striped Cardinalfish, Nurseryfish, Sharptooth Cardinal.

Found singly or in small to large schools, sheltering during the day in the arms of branching corals, in dark crevices, under ledges, and in the spines of the sea urchin Diadema setosum, dispersing at night foraging for food.
They feed nocturnally on crustaceans, small fish, and molluscs.
Length - 13cm
Depth - 0-40m
Widespread Indo-Pacific

Shelters in Spiny Sea Urchin - Diadema setosum
http://www.whatsthatfish.com/fish/spiny-sea-urchin/332

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. Ref: https://www.fishbase.se/summary/5482