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Key Facts
- They are renowned for their striking, brilliant electric blue color. This species exhibits distinct sexual dimorphism (visual differences between sexes). Males are generally larger, often feature a bright orange or yellow tail, and lack a dorsal spot. Females usually remain entirely blue but possess a distinct small black spot at the base of their dorsal fin.
- They are omnivorous but lean heavily toward a planktonic diet. They feed primarily on zooplankton floating in the water column, small benthic crustaceans (like copepods), and filamentous algae scraped from rocks.
- Despite their small size, they live up to the "Devil" in their common name. They are intensely territorial and highly aggressive, actively defending their chosen rock crevice or coral branch against intruders, including much larger fish.
Categories
Ornamental fish
Product information
The cornflower sergeant major is a tropical reef fish with a bright blue body and striking appearance. It lives in shallow coral reefs, is active, and often forms groups. Feeding on plankton and algae, it is territorial. During breeding, males guard the eggs, showing strong parental care.
