Longhorn Cowfish (Lactoria cornuta)
Reef compatible with caution. Requires expert-level care. Peaceful disposition. Minimum tank size of 100 gallons. Mature size reaches up to 18 inches.
Specifications
| Feature | Value |
|---|---|
| Species | Lactoria cornuta |
| Reef Compatibility | With caution |
| Care Level | Expert-only |
| Disposition | Peaceful |
| Minimum Tank Size | 100 gallons |
| Mature Size | 18 inches |
FAQ
Is the Longhorn Cowfish safe to keep with other reef fish?
The Longhorn Cowfish can be kept in a reef tank with caution. It may pose a threat to smaller invertebrates and some corals due to its feeding behavior. Careful monitoring is required.
What tank size is recommended for a Longhorn Cowfish?
A minimum tank size of 100 gallons is required to provide adequate space and stability for this species.
How long does it take for a Longhorn Cowfish to reach maturity?
The Longhorn Cowfish can grow to a mature size of 18 inches, which typically takes several years under proper conditions.


Piers Jackson –
I’ve kept this cowfish for over a year in a 120-gallon tank. It’s peaceful and doesn’t bother the corals, though I do remove small polyps occasionally. Water parameters are stable, and the fish is active during the day. Requires a lot of attention, but it’s a rewarding addition to a reef setup.
Brandon Morgan –
The fish arrived healthy and has adapted well to my tank. I monitor it daily to ensure it doesn’t eat small invertebrates. It’s not aggressive, and it’s a good visual focal point. I would recommend it only for experienced reef keepers.
Heather Sanderson –
It’s a unique-looking fish, and it’s not too active. I noticed it occasionally nips at small anemones, so I’ve moved them away. The tank size is large enough, and it seems to be adjusting well. Not the easiest to maintain, but worth the effort.