Danio tinwini is a tiny spotted fish from Myanmar with a unique golden dot pattern, an excellent choice for planted nano tanks of 40 liters or more.
Overview
Danio tinwini, known in the hobby as the gold ring danio, is one of the most miniature and charming fish in the Cyprinidae family. This species was described relatively recently and is named after Tin Win, a Burmese fish collector who made a significant contribution to the study of Myanmar's ichthyofauna. In the wild, Danio tinwini inhabits shallow streams and river tributaries in northern Myanmar, where it favors areas with moderate current and abundant vegetation.
The defining feature of this fish is its unique pattern of golden-yellow dots and spots on a dark body. Unlike most danios, which display longitudinal stripes, Danio tinwini has a distinctly spotted pattern that makes it instantly recognizable. Adults reach only 2.5–3 cm, making this species an ideal candidate for nano aquariums. In my experience, a school of 10–12 tinwini in a well-planted tank creates an incredibly lively and dynamic display — the fish are constantly in motion, shimmering with golden sparks. Lifespan under proper care is 2–4 years.
Tank Requirements
A group of Danio tinwini can be housed in an aquarium of 40 liters or more. Despite their miniature size, these fish are remarkably active and need ample space for free swimming. Optimal water parameters are: temperature 22–26°C, pH 6.0–7.5, general hardness (GH) 5–15. The broad acceptable range makes this species straightforward to keep.
I recommend decorating the tank with live plants — place cryptocoryne, Java moss, or hornwort along the sides and background, leaving the central zone open for swimming. Floating plants such as water lettuce or riccia help create soft, diffused lighting under which the golden dots on the fish's body look especially striking. A dark substrate is best, as it allows the tinwini's coloration to show at its brightest. Moderate flow from the filter is welcome, since these danios naturally inhabit flowing waters. Be sure to provide a tight-fitting lid — like all danios, tinwini are excellent jumpers.
Feeding and Diet
Danio tinwini is an omnivorous species that poses no feeding difficulties. The staple diet can consist of high-quality micro-flakes or micro-granules designed for small tropical fish. However, to maintain vibrant coloration and overall health, I recommend regularly supplementing with live or frozen foods: baby brine shrimp, daphnia, cyclops, and micro-worms.
It is important to account for the tiny mouth size of these fish — food must be correspondingly small. Feed small portions 2–3 times per day. The fish take food primarily in the mid-water column and near the surface, rarely descending to the bottom. Make sure all food is consumed within 2–3 minutes to help maintain water quality in a small tank. A varied diet not only strengthens the fish's immune system but also noticeably intensifies the golden pattern.
Care and Maintenance
Danio tinwini is a hardy species with a care level of 2 out of 5, making it an excellent choice for beginning aquarists. Nevertheless, due to the small size of the fish and typically modest tank volume, it is important to closely monitor water parameter stability.
Weekly water changes of 20–25% are essential for keeping the fish healthy. Use a reliable filter with gentle outflow that provides both biological and mechanical filtration. Test water parameters regularly — ammonia and nitrites must remain at zero. Like other small danios, such as the glowlight danio or celestial pearl danio, tinwini are sensitive to sudden parameter swings, so use water of similar temperature and composition during changes.
Watch the fish closely: fading of the golden pattern, lethargy, or loss of appetite signal possible problems with tank conditions and call for an immediate check.
Compatibility
Danio tinwini is a peaceful schooling species with an aggression rating of 2 out of 5. They should be kept in a group of at least 8, and ideally 10–12. In a larger school the fish display natural behaviors, feel more confident, and show their best coloration. In small groups, tinwini become timid and pale.
Ideal tankmates are other peaceful micro-fish of comparable size. Excellent choices include small rasboras such as chili rasbora, other danio species like emerald dwarf danio and glowlight danio, as well as pygmy corydoras as bottom dwellers. Peaceful dwarf shrimp — neocaridina or cherry shrimp — also make wonderful companions.
Keeping them with large or aggressive species is strongly discouraged — at just 2.5–3 cm, tinwini easily become prey. Large fish, even peaceful ones, should also be avoided, as they may accidentally swallow such a tiny tankmate.
Breeding
Breeding Danio tinwini in the aquarium requires some preparation, with a difficulty rating of 3 out of 5. This species is a typical egg scatterer and shows no parental care.
For spawning, prepare a separate tank of 10–15 liters with a water level of about 10–15 cm. Cover the bottom with Java moss, fine-leaved plants, or a spawning mesh to protect the eggs from being eaten by the parents. Raise the temperature to the upper end of the range — 25–26°C — and keep the water soft and slightly acidic. Select a well-fed female with a rounded belly and one or two males with the brightest coloration. Condition the breeders with live foods for 1–2 weeks before spawning.
Spawning usually occurs in the morning hours. Once the eggs are laid, the adults must be removed immediately — they will readily eat their own eggs. The tiny eggs hatch in 2–3 days, and a couple of days later the fry begin free-swimming. First foods should be infusoria, micro-worms, or specialized liquid fry food. After 7–10 days the fry can accept baby brine shrimp. Growth is relatively fast, and by 6–8 weeks the juveniles begin developing the characteristic spotted pattern of adult fish.