Helmet Cowfish EXPERT ONLY (Tetrasomus gibbosus)

Fish in the family Ostraciidae. Expert care. Not Reef Safe.

Helmet Cowfish EXPERT ONLY

Quick facts

Scientific nameTetrasomus gibbosus
FamilyOstraciidae
Care levelExpert
Reef safetyNot Reef Safe
TemperamentPeaceful
Dietomnivore
Adult size10 in
Minimum tank size75 gallons
Water parametersTemperature: 72-78°F pH: 8.1-8.3 Salinity: 1.02-1.025
Feeding schedule2-3 times daily

Appearance

Tetrasomus gibbosus has a distinctive boxy, compressed body with a pronounced hump on the dorsal surface, giving it a helmet-like appearance. Coloration ranges from yellow to olive-brown with darker reticulated markings and a pale belly.

Diet and feeding

Feed small portions 2–3 times daily with a mix of quality marine flakes, frozen mysis shrimp, small crustaceans, and occasional vegetable matter. Offer varied foods to support health and coloration.

Difficulty and care for the Helmet Cowfish EXPERT ONLY

Moderate - Requires some experience due to specific dietary water or tank requirements. Best suited for intermediate aquarists.

Origin and habitat

Indo-Pacific from the Red Sea and East Africa to Hawaii and the Great Barrier Reef.

Log Helmet Cowfish EXPERT ONLY in your reef tank

Reef Trak gives you the full record on every species in your tank: acquisition date, source, photos, parameters at time of stocking, and links to maintenance and feeding events. Track Helmet Cowfish EXPERT ONLY alongside everything else in your reef.