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Thornback Cowfish (Ostracion thornback)

Find Thornback Cowfish across reef-livestock retailers and from fellow hobbyists on ReefDock. Compare sources, check live pricing where available, and review source-tank parameters on Reef-Trak-verified fish listings before you buy.

Thornback Cowfish
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Where to buy Thornback Cowfish

ReefDock searches the following reef retailers for this fish. Click through to see the live price.

  • Saltwaterfish

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    Search Saltwaterfish
  • Amazon

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    Search Amazon
  • Petco

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    Search Petco

About Thornback Cowfish

Distinctive boxy body shape with a tan or brown coloration and darker spots or blotches covering the head and body. Pronounced horn-like protrusions above each eye, giving it the "thornback" common name.

Key facts

Care Requirements
• 75+ gallon tank with excellent water quality (stable pH 8.1-8.3, dKH 8-12) • Sensitive to poor conditions; requires pristine water, low nitrate/phosphate • Peaceful but may nip at invertebrates and small crustaceans • Needs varied diet: meaty foods, quality pellets, occasional greens • Slow-moving; prefers calm tank without aggressive fish
Diet Details
Feed a varied diet of small crustaceans (copepods, amphipods), small mollusks, and meaty foods. Supplement with quality flake or pellet food. They forage continuously and may pick at live rock and sand.
Reef safety
Not Reef Safe
Appearance
Distinctive boxy body shape with a tan or brown coloration and darker spots or blotches covering the head and body. Pronounced horn-like protrusions above each eye, giving it the "thornback" common name.
Common Health Issues
Marine ich, Fin rot, Swim bladder disorder, Hole-in-the-head disease, Columnaris disease
Water Parameters
Temperature: 72-78°F pH: 8.1-8.4 Salinity: 1.02-1.025
Max Size
9
Family
Ostraciidae
Feeding Schedule
Feed 2-3 times daily
Origin
Indo-Pacific region from the Philippines and Indonesia to Australia and the Great Barrier Reef.
Care Level
Moderate
Difficulty Level
Moderate - Thornback Cowfish requires standard marine aquarium maintenance and intermediate fish keeping skills.

Looking for a hobbyist seller?

ReefDock's marketplace lets reef-keepers sell fish directly to other reef-keepers with Stripe-secured checkout and live-arrival photo confirmation. Browse current fish listings on ReefDock, or list your own.

Verify the source tank before you buy

ReefDock is the sister app to Reef Trak. Sellers who maintain a Reef Trak tank log can publish source-tank parameters on eligible fish listings — so you can see the conditions a fish was raised in before you buy. Log this fish on Reef Trak.

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