Butter Hamlet
Hypoplectrus unicolor
A Caribbean reef predator surprisingly well-suited to beginner saltwater tanks.

About
The Butter Hamlet (Hypoplectrus unicolor) is one of the more understated reef fish from the Caribbean, found across Florida, the Bahamas, and throughout the Caribbean basin but notably absent from the Gulf of Mexico. Its appearance is relatively plain compared to other hamlet species, mostly a soft yellowish or pale tan body, but that simplicity has a certain quiet appeal on a reef display. What this fish lacks in flashy patterning it makes up for in personality and hardiness, and it has a reputation for adapting well to captive life, which is somewhat unusual for a small predatory reef species. Being a carnivore, it will go after smaller tankmates, so pairing it with fish that can hold their own in terms of size is important. That predatory nature is worth taking seriously. Anything small enough to fit in its mouth is fair game. On the upside, it is generally considered manageable for newer saltwater keepers, provided the tank is stocked thoughtfully. It has been successfully bred in captivity, which speaks to how well it tolerates aquarium conditions. For someone looking to keep a small, robust Caribbean reef fish without a lot of fuss, the Butter Hamlet is a solid choice.
Similar species
Other fish you might consider
From the same region
Share the same natural habitat. Great for a biotope-themed tank
Frequently asked questions
- How big does the Butter Hamlet get?
- The Butter Hamlet reaches about 3–5" as an adult.
- What size tank does the Butter Hamlet need?
- A minimum of 40 gallons is recommended for the Butter Hamlet.
- What water parameters does the Butter Hamlet need?
- The Butter Hamlet does best with a temperature of 72–78°F, a pH of 8.1–8.4, hardness around 8–12 dGH.
- Is the Butter Hamlet aggressive?
- The Butter Hamlet is semi-aggressive. It can work in a community with careful tankmate choices and enough space.
- What does the Butter Hamlet eat?
- The Butter Hamlet is a carnivore. It needs a meaty, protein-rich diet of frozen or live foods.
- How long does the Butter Hamlet live?
- With good care, the Butter Hamlet typically lives 10-15 years.
- Is the Butter Hamlet reef safe?
- The Butter Hamlet is not considered reliably reef safe and may harm corals or invertebrates.