Any fish belonging to the family Apogonidae, commonly known as cardinal fish.
From Apogon (the genus name) + -id (indicating membership in a group). The suffix -id is used in taxonomy to denote individual members of a family.
These fish are called 'cardinals' because of their bright red coloring, but they're masters of stealth—they stay hidden during the day and only come out to hunt in the darkness of the reef.
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