Lactoria cornuta (Longhorn Cowfish)
Reef Compatible – With Caution
Care Level – Expert-only
Disposition – Peaceful
Min. Tank Size – 100 gallons
Mature Size – 18 inches
Product Specifications
| Feature | Detail |
|---|---|
| Size (Adult) | 18 inches |
| Size (Adult Range) | 4″ to 5″ (XL) |
| Compatibility | Reef compatible with caution |
| Difficulty Level | Expert-only |
| Behavior | Peaceful |
| Minimum Tank Size | 100 gallons |
FAQ
Is this fish suitable for a beginner aquarium keeper?
No, this species requires expert-level care and a minimum tank size of 100 gallons. It is not recommended for beginner aquarists.
Can this fish coexist with other reef inhabitants?
It is reef compatible with caution. Some species may still pose a threat, so careful selection of tank mates is required.
What is the expected growth rate of this fish?
The fish grows to a mature size of 18 inches over time, with a typical size range of 4 to 5 inches in the XL category.


Anne Davidson –
I’ve kept this cowfish for over a year in a 100-gallon tank. It’s peaceful and doesn’t bother other fish. Only issue is it needs stable water parameters and a large tank. Worth the effort for a unique look.
Heather Henderson –
The fish is beautiful and stays calm. I had to be careful with corals, but it hasn’t damaged any. Requires a lot of research before adding to a reef tank.
Phil Tucker –
It’s a striking addition to the tank, but I noticed it’s more active at night. I’m still learning how to manage its environment. Not for small tanks.