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FishSaltwaterBeginnerSemi aggressive

Beau Gregory

Stegastes leucostictus

Also known as: Beaugregory, Yellow-belly

A small, personable damselfish that tends its own algae garden on the reef floor.

Beau Gregory
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© (c) Evelin Araujo, some rights reserved (CC BY-NC) · CC-BY NC

About

The Beau Gregory (Stegastes leucostictus) is a small damselfish from the Western Atlantic, ranging from southern Florida and Bermuda down through the Gulf of Mexico and all the way to Brazil. In the wild it turns up across a surprisingly broad range of habitats, seagrass beds, rocky reefs, sandy flats, mangrove edges, and sponge beds, always staying close to the bottom, rarely venturing more than half a foot off the substrate. That bottom-hugging lifestyle translates well to aquarium keeping. Juveniles are particularly attractive, showing bright blue spotting against a yellowish body, while adults tend toward a more muted but still appealing coloration with a pale to yellow belly. The origin of one of its nicknames. One of the more interesting behaviors this species brings to a tank is algae farming: like other members of its genus, it will actively tend and defend a patch of algae growth on a hard surface, which gives it a sense of purpose and territory even in a community setting. Despite that territorial tendency, it is generally considered one of the more docile damselfishes, making it a workable option for reef-adjacent setups. Males guard egg clutches and fan them with their fins, so breeding behavior is occasionally observed in home aquaria. A good choice for a hobbyist getting into saltwater keeping.

Frequently asked questions

How big does the Beau Gregory get?
The Beau Gregory reaches about 2.5–4" as an adult.
What size tank does the Beau Gregory need?
A minimum of 125 gallons is recommended for the Beau Gregory.
What water parameters does the Beau Gregory need?
The Beau Gregory does best with a temperature of 72–82°F, a pH of 8–8.4.
Is the Beau Gregory aggressive?
The Beau Gregory is semi-aggressive. It can work in a community with careful tankmate choices and enough space.
What does the Beau Gregory eat?
The Beau Gregory is an omnivore. It does well on a varied diet of quality flake or pellet plus occasional frozen or live foods.
How long does the Beau Gregory live?
With good care, the Beau Gregory typically lives 6-7 years.
Is the Beau Gregory reef safe?
The Beau Gregory is not considered reliably reef safe and may harm corals or invertebrates.