Wrasse

Wrasse key facts

Care level

Beginner-friendly

Lifespan

5-10 years

Size

8-20cm

Diet

Frozen food, Artificial feed

Housing

Sand bed (5cm+) needed (sleeps buried in sand)

Diet & Feeding

Feed frozen and prepared foods. Many Halichoeres and Coris species act as cleaners, eating flatworms, bristleworms and small snails.

Feeding

Cleaner fish that eats parasites

Tank Mates & Compatibility

Varies by species, but many are peaceful. Small shrimp and juvenile snails may be eaten, so check each species before housing with invertebrates.

Health & Cautions

Highly active and very prone to jumping out, so a gap-free lid is essential. Difficulty varies widely, so check each species' diet before buying.

About Wrasse

The family Labridae (wrasses) encompasses over 600 species inhabiting shallow tropical and subtropical seas worldwide, making it one of the most species-rich and colorful families in the marine aquarium hobby. Color patterns differ dramatically between juveniles, females, and males—many species undergo striking sex-change transitions accompanied by brilliant shifts to blue, green, red, or purple hues. Wrasses have a characteristic elongated, fusiform body and a distinctive rowing swimming style using their pectoral fins. Their temperament is typically bold and curious; settled individuals often interact with their keepers. Most species lean toward carnivory, with several well-known "cleaner" wrasses consuming parasites and small crustaceans in the wild. The instinct to burrow into sand at night—an anti-predator behavior retained from the wild—is one of the most captivating aspects of keeping wrasses and is a delight to observe in a home aquarium. Given suitable conditions, wrasses are relatively hardy and long-lived, making them a popular choice for hobbyists venturing into the marine fishkeeping world.

7 things to know before welcoming a Wrasse

1. 1Sand-Diving Behavior

   Most wrasses bury themselves in sand at night or when startled, so a fine coral sand bed of at least 5 cm deep is essential. Without adequate substrate they may become stressed and refuse to eat. It is normal for newly introduced wrasses to remain hidden in the sand for several days.

2. 2Escape-Proof the Tank

   Wrasses are powerful swimmers and notorious jumpers, especially when startled. A tight-fitting lid with no gaps around cables or pipes is essential to prevent fatal escape accidents. Securing the aquarium cover is one of the most important steps before introducing any wrasse.

3. 3Choosing Tank Mates

   Wrasses can be territorial toward their own and related species, so carefully consider species and gender combinations when keeping multiple wrasses together. Small shrimp and other crustaceans are often viewed as prey and are generally not safe tank mates. Pairing wrasses with peaceful, medium-sized fish tends to work best.

4. 4Feeding and Diet

   Wrasses are predominantly carnivorous, feeding on worms, crustaceans, and small fish in the wild. Transitioning them to frozen mysis, brine shrimp, and high-quality pellets is key to long-term success. Feed two to three small portions daily, removing any uneaten food promptly.

5. 5Water Quality Management

   Maintain salinity at 1.023–1.025, water temperature between 24–26°C, and keep nitrates as low as possible, as with most marine fish. Some wrasse species are moderately sensitive to declining water quality, making regular water changes and proper filtration essential. Pay special attention to avoiding sudden parameter shifts during the acclimation period.

6. 6Sex-Changing Species

   Many wrasse species are protogynous hermaphrodites, meaning they change from female to male as they mature or in response to social hierarchy. The dominant individual in a group often transitions to male, so do not assume fixed sexes in a pair or group. This sex-changing behavior is a normal biological trait, not a sign of illness.

7. 7Tank Size and Initial Costs

   Even smaller wrasse species (8–10 cm) are best kept in a tank of at least 60 cm, as they are active swimmers that need room to roam. Initial setup costs for a complete marine system, including tank, filtration, lighting, salt mix, and hydrometer, typically range from roughly 30,000 to 100,000 yen. Wrasse prices vary widely by species, from a few hundred to tens of thousands of yen.

Frequently asked questions about Wrasse

Q.Can wrasses be kept in a reef tank with corals?

A.It depends on the species. Many wrasses such as fairy wrasses and sixline wrasses are reef-safe and won't bother corals. However, some species will prey on ornamental shrimp and small crustaceans, so verify the specific species' diet before adding it to a mixed reef system.

Q.Is it abnormal if my wrasse stays buried in the sand?

A.Burrowing during the first days after introduction or at night is completely normal for wrasses. If the fish stays buried for extended periods during daylight hours, it may signal stress or poor water quality. Check temperature, salinity, and ammonia levels, and look for any sudden environmental changes.

Q.Can I keep multiple wrasses in the same tank?

A.Keeping a harem—one male with multiple females—often works well in larger tanks of 90 cm or more. Keeping two males of the same species together typically leads to serious aggression and is best avoided. Even different species that look similar in color or body shape can compete with each other.

Q.My wrasse won't eat prepared food. What should I do?

A.Start by stimulating appetite with frozen brine shrimp or mysis, then gradually mix in small amounts of pellets or flake food. Increasing the ratio of prepared food over one to two weeks is an effective approach. If refusal persists beyond that, revisit whether the food type matches the species' natural preferences.

Q.How much does it cost to keep wrasses?

A.Initial setup costs for a marine tank including live sand, lighting, filtration, and a hydrometer typically range from ¥30,000–¥100,000. Fish prices vary widely by species, from around ¥2,000 to tens of thousands of yen. Monthly running costs for electricity, salt mix, food, and water test kits generally fall in the ¥3,000–¥8,000 range.

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