Peacock Gudgeon – Tateurndina ocellicauda

The Peacock Gudgeon (Tateurndina ocellicauda) is a small and stunning freshwater fish that has won the hearts of many aquarium enthusiasts. Its iridescent body, peaceful temperament and interesting behavior make it a perfect centerpiece for nano tanks and community aquariums alike. In this article, we will look at how to keep this species healthy and thriving, from tank setup to breeding, and how to choose the right equipment and aquarium for them. You will also learn how MB Store can support you with suitable filters, lighting, heaters and other essential accessories for a successful Peacock Gudgeon aquarium.

Origin and natural habitat of the Peacock Gudgeon

The Peacock Gudgeon, scientifically known as Tateurndina ocellicauda, comes from Papua New Guinea, where it inhabits slow-moving streams, small rivers and backwaters. These waters are typically clear to slightly stained with tannins, providing numerous hiding places among roots, stones and dense vegetation. Understanding this natural environment helps aquarists create a more suitable and comfortable home aquarium.

In the wild, the substrate consists mainly of sand, fine gravel and organic debris. The water parameters are usually slightly acidic to neutral, with low to moderate hardness. Temperatures in these habitats are warm year-round, typically between 24–28 °C. By imitating these conditions, you can significantly improve the health, coloration and breeding success of your Peacock Gudgeons.

The species is often found in areas with gentle flow and calm pools, where they can hover near the bottom or midwater, searching for small invertebrates. This behavior explains their preference for well-structured aquariums with stable hiding spots and quiet zones. A peaceful, low-stress environment in captivity is crucial, as these fish can become shy if kept with overly active or aggressive tank mates.

Appearance, sexing and behavior

Peacock Gudgeons are loved for their vivid and unusual coloration. Their base body color is a soft blue to bluish-silver with bright yellow hues on the head and underside. Across the body, especially towards the tail, you will see red, orange and sometimes pinkish stripes or spots, giving the fish a “peacock-like” shimmering look that stands out in planted aquariums.

The fins are usually transparent to yellowish with striking red and blue markings. The caudal fin often shows an eyespot (ocellus) near its base, which inspired the species name “ocellicauda” (meaning “eyed tail”). Under good conditions and proper nutrition, the colors are intense and vibrant. Suboptimal care, stress or poor water quality can dull these colors, so a stable and well-maintained environment is essential.

Sexing Peacock Gudgeons is relatively straightforward once they are mature. Males tend to be slightly larger, more intensely colored and have a pronounced, rounded forehead, sometimes forming a small nuchal hump. Their dorsal and anal fins are usually more elongated. Females are smaller and more slender, with a rounder belly—especially noticeable when carrying eggs. A yellow or golden belly with a distinct black edge can be a good indication of a female in breeding condition.

Behaviorally, the species is peaceful and generally suitable for community aquariums. They spend a lot of time hovering in the mid and lower water levels, exploring plants, wood and caves. Males may display mild territorial behavior, especially during breeding, but serious aggression is rare if the tank is large enough and has adequate hiding spots. Keeping them in small groups, for example one male with two to three females, or a group with multiple males in a larger aquarium, can encourage natural displays and reduce stress.

Because they are relatively shy compared to some fast-moving schooling fish, tank mates should be chosen carefully. Overly boisterous fish can outcompete them for food and make them hide constantly. Peaceful tank mates like small tetras, rasboras, dwarf Corydoras, Otocinclus and small peaceful gouramis can work very well.

Ideal aquarium setup for Peacock Gudgeons

Creating the right environment is crucial for the long-term well-being of Peacock Gudgeons. Although they stay relatively small (around 6–7 cm), they will appreciate space to swim, explore and establish small territories. For a pair or trio, an aquarium of 40–60 liters can work, but a larger tank offers more stability and enables a more attractive aquascape.

MB Store offers a variety of aquariums suitable for Peacock Gudgeons, from compact nano tanks to larger planted setups. When choosing a tank, consider both the final number of fish and the type of aquascape you want to create. A longer tank is usually better than a tall one, as it provides more horizontal swimming space and territory for males.

The aquascape should combine open swimming areas with a rich structure of plants, wood and stones. Use fine sand or small-grain gravel as substrate, which reflects their natural habitat and allows you to grow rooted plants. Dense vegetation such as Java fern, Cryptocoryne, Vallisneria, Anubias or stem plants provides shelter and visual barriers, helping to reduce stress and aggression.

Hardscape elements like driftwood and rocks form caves and crevices that the fish can use for hiding and breeding. You can also add ceramic tubes, coconut shells or special breeding caves. These help males choose a suitable “nest” and make it easier to observe breeding behavior. Floating plants such as Salvinia or Amazon frogbit help dim the light and create a more natural, dappled effect, which often makes shy species feel more secure.

Filtration should be gentle but efficient. Peacock Gudgeons do not like strong, turbulent currents. A quality internal filter, sponge filter or adjustable external filter from MB Store will keep water clean while maintaining a calm environment. Using an air-driven sponge filter can be particularly beneficial in smaller tanks, providing both biological filtration and gentle water movement.

Lighting should be moderate, bright enough for plants but not overwhelmingly harsh. LED fixtures available at MB Store allow you to fine-tune intensity and color spectrum, supporting both plant growth and fish coloration. Use a timer to maintain a stable photoperiod of about 8–10 hours per day, which helps prevent algae and keeps the fish on a regular day-night rhythm.

An aquarium heater is usually necessary to keep the water temperature within the ideal range. A reliable heater with a thermostat, properly sized for the aquarium volume, ensures stable conditions. MB Store offers various heaters and controllers, which are essential because temperature fluctuations can stress Peacock Gudgeons and make them more susceptible to disease.

Water parameters and maintenance

To keep Peacock Gudgeons healthy and colorful, maintaining stable and appropriate water parameters is one of the most important tasks. The preferred temperature range lies between 24–26 °C, although they can tolerate slightly higher temperatures up to around 28 °C for short periods. Consistency is more important than hitting an exact number.

The pH should be slightly acidic to neutral, typically between 6.0 and 7.5. General hardness (GH) and carbonate hardness (KH) should be low to moderate. Many tap waters already fall into this range, but you may need to adjust parameters depending on your local supply. Using driftwood, catappa leaves or peat in the filter can slightly soften and acidify water while adding beneficial tannins.

Regular water changes are essential for good health and bright colors. A weekly water change of 25–40 % is usually sufficient in a properly stocked, well-filtered tank. Always match the temperature and, as closely as possible, the chemistry of new water to the aquarium water to avoid sudden shocks. Using a water conditioner helps remove chlorine and chloramines commonly present in tap water.

Monitoring water quality with test kits is highly recommended, especially in newly established aquariums. Ammonia and nitrite should always be at zero, while nitrate should be kept low through water changes and plant growth. High nitrate levels and accumulated waste can stress the fish, leading to faded colors, fin damage and increased disease risk.

Filtration media should be rinsed gently in aquarium water (not tap water) to preserve beneficial bacteria. Overly aggressive cleaning can disrupt the nitrogen cycle. Biological media, sponges and ceramics should only be cleaned when visibly dirty or when flow is reduced. Chemical media, like activated carbon or specialized resins, can be used selectively but are not mandatory for Peacock Gudgeons if maintenance and stocking are appropriate.

A well-maintained tank also includes careful feeding practices. Overfeeding not only harms the fish but also quickly deteriorates water quality. Remove uneaten food after a few minutes and observe how your Peacock Gudgeons behave and feed. Healthy fish are active, curious and display full, open fins and clear eyes.

Feeding and nutrition

In nature, Tateurndina ocellicauda feeds mainly on small invertebrates, insect larvae and zooplankton. This carnivorous inclination should be reflected in their diet in the aquarium. A varied, protein-rich menu helps maintain vibrant coloration, good growth and breeding condition.

High-quality micro-pellets or granules formulated for small carnivorous or omnivorous fish are a solid staple. Choose brands that list whole fish, krill or other high-quality animal proteins as primary ingredients. MB Store offers a wide selection of food suitable for small, colorful species like Peacock Gudgeons, including slowly sinking micro-pellets that stay in the water column for longer, giving them time to feed.

Frozen foods such as bloodworms, daphnia, cyclops, brine shrimp and mosquito larvae are highly appreciated and closely mimic their natural diet. Supplementing their diet with such foods two to four times per week will enhance color and vitality. Live foods, if sourced safely, can further stimulate natural hunting behavior and are especially useful when conditioning fish for breeding.

While they are primarily carnivorous, they may also nibble on some soft plant material or algae, but this is not a major component of their nutrition. Using a high-quality, varied diet ensures they receive all necessary vitamins and minerals. You can also occasionally provide vitamin-enriched frozen or live foods for an extra nutritional boost.

Feeding should be done in small portions two to three times per day, depending on your schedule and the number of fish. Give only what they can consume within a few minutes. This minimizes waste and helps maintain good water quality. Observing feeding time also gives you the opportunity to notice early signs of disease or stress, such as lack of appetite or unusual swimming behavior.

Tank mates and community aquarium considerations

Although Peacock Gudgeons are peaceful fish, compatibility with other species should still be carefully planned. Their small size and relatively calm behavior make them vulnerable to large or aggressive tank mates. Fin-nippers or strongly territorial fish can cause chronic stress and damage to their delicate fins.

Good tank mates include small, peaceful schooling fish like neon tetras, ember tetras, Harlequin rasboras, and other small rasbora species. Peaceful bottom dwellers such as pygmy Corydoras, Kuhli loaches (with suitable substrate and hiding places) and Otocinclus catfish are also good companions. Shrimp, especially larger species like Amano shrimp, can coexist if there are ample hiding spots, although very small shrimp or shrimplets may be seen as food.

It is important to avoid large cichlids, big barbs, or any species known for fin nipping. Even some dwarf cichlids can be too pushy in small tanks. Bettas may sometimes coexist, but it depends on the individual temperament and tank layout; caution is advised. If you wish to breed Peacock Gudgeons, a species-only tank or at least a separate breeding tank is recommended to protect eggs and fry from being eaten by other fish.

Social structure is another important aspect. While pairs can be kept successfully, they often thrive in small groups. Keeping one male with two or three females reduces the pressure on a single female and allows natural social interaction. In larger aquariums, multiple males can be kept, provided there are enough visual barriers and territories so that each male can claim a small area without constant conflict.

Observe your fish after adding new tank mates. If you notice persistent chasing, fin damage or continuous hiding, reconsider your stocking choices. A well-planned community aquarium that considers the needs and temperament of Peacock Gudgeons will reward you with active, colorful and confident fish that display natural behavior.

Breeding Peacock Gudgeons in the aquarium

One of the most fascinating aspects of Tateurndina ocellicauda is their relatively accessible breeding behavior, even for intermediate aquarists. Under the right conditions, Peacock Gudgeons will often spawn in community tanks, but for higher fry survival, it is better to use a dedicated breeding setup.

Begin with a healthy group of adults and gradually condition them with a protein-rich diet including frozen and live foods. Maintain excellent water quality, stable temperature around 25–26 °C and slightly softer, acidic water if possible. Provide multiple caves and tight, enclosed spaces—small ceramic tubes, PVC pieces, coconut shells or narrow rock crevices. The male will usually choose a cave and start defending and cleaning it.

When a female is ready to spawn, her belly becomes noticeably round and she may display brighter coloration. She will inspect the male’s chosen cave, and if she accepts him, spawning occurs inside. The female deposits a cluster of adhesive eggs on the cave ceiling or walls, after which the male fertilizes them. The female usually leaves the cave afterward, and the male takes over care of the eggs.

The guarding male fans the eggs with his fins to ensure a good supply of oxygen and prevent fungus. During this period, he can be quite protective of his territory and may chase away other fish, including the female. The eggs generally hatch within 4–7 days, depending on temperature. Once the fry hatch, you have two main strategies: leave them with the father or transfer them to a separate rearing tank.

Some aquarists choose to move the entire cave with eggs into a small rearing tank with the same water as the breeding tank. An air stone or sponge filter provides gentle circulation, and a few drops of methylene blue or similar antifungal agent are sometimes used to protect the eggs (use cautiously and follow product instructions). After hatching, Peacock Gudgeon fry are tiny and require very small foods such as infusoria, commercial liquid fry food or freshly hatched brine shrimp nauplii (once they are large enough).

Regular small water changes in the rearing tank help maintain excellent water quality without stressing the fry. As they grow, you can gradually introduce microworms, powdered fry foods and finally crushed pellets or flakes. Good nutrition during the first weeks is crucial for strong, healthy juveniles. After some weeks to a few months, the young will start to show their characteristic colors and can be integrated into a community tank, provided they are large enough not to be eaten by other fish.

Breeding Peacock Gudgeons can be a very rewarding experience that deepens your understanding of fish behavior and life cycles. With careful observation and gentle handling, even hobbyists without previous breeding experience can achieve success.

Equipment, care routine and how MB Store can help

Successful long-term keeping of Peacock Gudgeons depends not only on knowledge but also on reliable equipment. MB Store offers a broad selection of aquariums, filters, heaters, lighting, substrates and decorations that make setting up and maintaining an optimal habitat much easier.

When starting a new Peacock Gudgeon aquarium, consider the following checklist:

• A suitably sized aquarium with a secure cover
• Gentle, efficient filter (sponge, internal or canister with adjustable flow)
• Accurate heater with thermostat
• LED lighting appropriate for plants and fish
• Fine substrate (sand or small-grain gravel)
• Plants, driftwood, caves and hiding places
• Water conditioner and basic liquid test kits
• High-quality dry, frozen and possibly live foods

MB Store’s range of filters includes models suitable for nano aquariums as well as larger community tanks. When selecting a filter, aim for a balance between sufficient turnover and gentle flow. Many filters offer adjustable output, spray bars or diffusers that help soften the current, making them ideal for Peacock Gudgeons.

Heaters available at MB Store cover all typical aquarium sizes. For most tanks, a rule of thumb of 1 W per liter is sufficient, though room temperature and insulation also matter. Always pair your heater with a thermometer to verify accuracy and stability. Sudden temperature drops can stress your fish, especially in smaller tanks that react more quickly to room temperature changes.

In terms of lighting, modern LED systems allow you to adjust intensity and color temperature. For planted Peacock Gudgeon aquariums, a neutral white light (around 6,000–7,000 K) supports plant growth and highlights the fish’s colors. Dimmable or programmable systems can simulate sunrise and sunset, creating a more natural environment and reducing sudden changes that might startle the fish.

A regular care routine is essential. Combine weekly partial water changes with basic tasks such as cleaning glass, gently vacuuming the substrate in open areas and pruning plants. Do not overclean; preserving beneficial bacteria is vital for a stable aquarium. A simple schedule, perhaps written down or tracked on your phone, helps ensure that maintenance is consistent rather than sporadic.

Should you wish to expand your aquarium collection or upgrade your current setup, MB Store’s selection of aquariums and accessories makes it simple to design a system specifically tailored to Peacock Gudgeons or other small ornamental fish. From compact tanks perfect for a single trio to larger planted landscapes, you can find solutions that match both your space and your aesthetic preferences.

By combining proper equipment from MB Store with the husbandry guidelines described above, you can offer Peacock Gudgeons an environment where they truly flourish—displaying their best colors, engaging behaviors and even spawning under your care.

FAQ – Peacock Gudgeon (Tateurndina ocellicauda)

Why are my Peacock Gudgeons hiding all the time?
Peacock Gudgeons often hide when they feel insecure or stressed. Common causes include overly bright lighting, lack of plants and caves, aggressive tank mates or unstable water parameters. Add more hiding places, use floating plants to soften the light, choose peaceful fish and check ammonia, nitrite, nitrate and temperature.

How many Peacock Gudgeons can I keep in my aquarium?
For a 40–60 liter aquarium, a pair or one male with two females is ideal. In larger tanks, you can keep several males, each with a small group of females, provided you create enough territories with plants and decorations. Avoid overcrowding, which causes stress and water quality problems, and always watch for aggression.

Do Peacock Gudgeons need live food?
They do not strictly require live food, but they benefit greatly from it. High-quality dry foods and frozen foods can meet their nutritional needs, while live foods like brine shrimp or daphnia improve color, vitality and breeding readiness. If you cannot provide live food regularly, offer frozen alternatives several times per week.

Can Peacock Gudgeons live in a community tank?
Yes, they are peaceful and generally suitable for community aquariums with other small, calm fish. Ideal companions include small tetras, rasboras and dwarf catfish. Avoid large, aggressive or fin-nipping species that may harass them. Provide ample plants and hiding places so that Peacock Gudgeons can retreat when they feel threatened.

How long do Peacock Gudgeons live in captivity?
With proper care, Peacock Gudgeons usually live around 3–5 years. Good water quality, stable temperatures, a varied diet and low stress are key factors influencing lifespan. Regular maintenance, suitable tank mates and a well-structured aquarium all contribute to keeping them healthy and active for as long as possible.