Sixline Wrasse

Overview

The Sixline wrasse (Pseudocheilinus hexataenia) is a popular marine fish known for its bold striping, lively personality and constant activity across the rockwork. In a well-established reef aquarium it can become a fascinating focal point, darting between caves and crevices as it explores the tank and hunts for natural food items. It is a small wrasse with a big presence, which is one reason it remains a favourite with aquarists looking for colour and motion in a marine display.

This species is generally regarded as a useful addition to many reef systems because it may pick at nuisance flatworms and other small pests. However, it is not a fish for every setup. Sixline wrasses can become territorial, especially in smaller aquariums or when housed with similarly shaped fish. For that reason, it is best kept by aquarists who already have some marine experience and a stable, mature saltwater tank. If you are new to marine fishkeeping, verify that your aquarium is fully cycled, well filtered and large enough before considering this species.

At Tropical Fish Co, we recommend choosing marine livestock only once your aquarium is thoroughly established and you can maintain water quality consistently. Because exact temperature, pH and adult size figures were not supplied with this listing, please verify your local water parameters and make sure your setup is appropriate before purchase.

Tank Setup

Sixline wrasses do best in a mature marine aquarium with plenty of live rock, secure hiding places and open swimming areas. They are naturally inquisitive and spend much of their time weaving through rockwork, so the layout should provide multiple caves, overhangs and narrow passageways. A tight-fitting lid is strongly advised, as active wrasses may jump when startled or during night-time movement.

For a species like this, stable marine conditions matter more than chasing a specific number. If you are unsure about temperature or pH targets for your own system, verify with your local water and use reliable saltwater test kits to confirm that all parameters are suitable for marine livestock. As a minimum, the aquarium should be mature, filtered appropriately and large enough to allow territory without crowding. We do not recommend any tank smaller than 40 litres for any fish, and in practice a larger, established reef system is far more suitable for this wrasse.

Strong water movement, good oxygenation and regular maintenance are important. Keep nitrate and phosphate under control through sensible stocking, routine water changes and effective mechanical and biological filtration. Because the Sixline wrasse is active and territorial, adding it to the aquarium at the right point in stocking order can help reduce aggression. In many mixed systems, it is often best introduced before more timid tank mates, but this should always be considered alongside the personalities of the fish already present.

Recommended aquarium features

• Established marine or reef aquarium with mature biological filtration
• Plenty of live rock for grazing, shelter and natural behaviour
• Secure lid or covered top to reduce jumping risk
• Stable water quality with regular testing and maintenance
• Open swimming space as well as sheltered areas
• Careful stocking plan to minimise territorial disputes

Diet & Feeding

The Sixline wrasse is a carnivorous marine fish that feeds on small meaty foods in the aquarium and may also hunt naturally occurring microfauna in the rockwork. In the wild it spends much of its time foraging, so it should be offered a varied diet rather than relying on one staple food. Good quality frozen marine foods, small meaty prepared foods and suitably sized pellets can all be included, provided they are accepted by the individual fish.

Feed small amounts several times a day where practical, as this better matches its active metabolism and helps prevent food being dominated by more assertive tank mates. Like all marine fish, overfeeding should be avoided to protect water quality. If the fish is newly imported or settling in, it may initially prefer live or frozen food before accepting prepared diets. Monitor feeding closely during the first weeks and adjust your approach based on the fish’s behaviour.

Because individual appetite can vary, always observe your fish during feeding and remove uneaten food promptly. If your aquarium contains other fish with competing diets, make sure the Sixline wrasse is actually receiving enough food. A varied feeding routine supports condition, colour and long-term health.

• Offer a varied carnivorous marine diet
• Include frozen, prepared and suitably sized meaty foods
• Feed in small portions to reduce waste
• Observe feeding response after introduction
• Do not rely on a single food source long term

Tank Mates & Temperament

The Sixline wrasse is usually active, bold and at times assertive. While it is often peaceful enough in the right setting, it can become territorial, particularly towards other wrasses or similarly shaped fish. In some aquariums it behaves well and integrates smoothly, but in others it may chase, nip or intimidate more delicate species. As with many marine fish, individual temperament varies, so careful planning is essential.

Good tank mates are generally sturdy marine species that are not overly timid and that occupy different parts of the aquarium. It is wise to avoid placing it with other small, similarly patterned or similar-bodied wrasses unless the system is sufficiently large and the introduction order is planned carefully. More delicate or slow-moving fish may be stressed by the Sixline’s busy behaviour. In reef tanks, invertebrates are often left alone, but compatibility can never be guaranteed for every individual fish.

If you want the best chance of success, keep the aquarium spacious, provide hiding areas, and avoid overcrowding. Introducing the Sixline wrasse last can sometimes reduce disruption, although this is not a universal rule. Always monitor its behaviour during the first days and be prepared to separate fish if persistent aggression develops.

Compatible choices may include

• Peaceful to moderately assertive marine fish of different shape and lifestyle
• Robust reef-safe species that are not easily intimidated
• Tank mates that occupy other areas of the aquarium

Avoid pairing with

• Other small wrasses, especially similar-looking species
• Very timid or slow-moving marine fish
• Overcrowded nano systems or immature aquariums

Breeding

Breeding Sixline wrasse in the home aquarium is not commonly reported and is not generally a realistic goal for most hobbyists. Like many marine species, reproduction in captivity can be difficult and typically requires specialised conditions, paired adults and careful larval rearing. If breeding is your aim, treat this species as a display fish rather than a straightforward breeding project.

For most aquarists, the priority is long-term maintenance, stable water quality and correct social management rather than attempting spawn reproduction. If you are interested in marine breeding, it is usually better to begin with species that are widely bred in captivity and better documented.

Health & Common Issues

As with all marine fish, the Sixline wrasse’s health is closely tied to water quality, stable salinity and low stress. Sudden parameter swings, poor oxygenation, crowded conditions and aggressive tank mates can all lead to problems. Because this species is active and inquisitive, stress may show as hiding, refusal to feed, rapid breathing or persistent pacing along the glass.

Newly imported marine fish can be sensitive during acclimatisation, so a calm introduction and careful observation are important. Quarantine is strongly recommended for marine livestock where possible, though any quarantine system must also be stable and appropriately sized. If you notice loss of appetite, torn fins, heavy breathing or unusual scratching, check water quality immediately and assess whether the fish is being bullied.

Common risk factors include poor diet, high stress, unsuitable tank mates and immature aquarium conditions. A varied feeding plan, sensible stocking and regular maintenance go a long way towards prevention. Because this species is often hardy once settled but still prone to stress in the wrong setup, prevention is better than cure.

• Maintain stable marine water conditions
• Quarantine new fish where practical
• Watch for bullying and fin damage
• Feed a varied, appropriate carnivorous diet
• Respond quickly to any sign of illness or stress

Buying From Us

When you order live fish from Tropical Fish Co, we pack and dispatch with care so your fish arrives in the best possible condition. Every shipment is prepared using appropriate livestock packing methods designed to support safe transit, and we aim to make the process as smooth as possible for both the fish and the customer. Please ensure someone is available to receive the delivery promptly and acclimate the fish carefully on arrival.

Live marine fish are a specialist purchase, so we strongly recommend checking that your aquarium is mature, fully prepared and compatible before placing your order. If you are unsure whether a Sixline wrasse is suitable for your system, verify your water parameters, tank size and current livestock first. A well-planned home aquarium gives the fish the best chance to settle, feed and thrive.

Our retail price for this specimen is £14.41. As with all live animal orders, delivery and guarantee terms depend on the condition of the aquarium at the time of arrival and the steps taken during acclimation. Follow our guidance closely, keep water stable and introduce the fish with care. If you are building a marine community, this species can be an engaging addition when matched to the right environment.

Beginner-level caveat: although the Sixline wrasse is small, it is not automatically a beginner fish. Success depends on a mature marine setup, stable husbandry and sensible tank mate selection. If you are new to saltwater fishkeeping, verify your aquarium is ready before choosing this species.

• Carefully packed live delivery
• Suitable for mature marine and reef aquariums
• Best kept in stable systems with planned tank mates
• Check compatibility before purchase
• Always acclimate slowly on arrival