Glowlight Rasbora Care Guide: Trigonostigma hengeli Warmth
Small, shimmering, and perfectly suited to planted nano tanks, Trigonostigma hengeli is the understated sibling of the popular harlequin rasbora. This glowlight rasbora care guide from Gensou Aquascaping at 5 Everton Park, Singapore, covers everything you need to bring out the best in these delicate Southeast Asian gems. Their warm copper glow becomes truly spectacular under the right conditions, rewarding patient keepers with a display that punches well above its weight.
Origin and Identification
Trigonostigma hengeli originates from the peat swamp forests of Borneo and Sumatra. They grow to just 2.5-3 cm, making them noticeably smaller than their harlequin cousin (T. heteromorpha). The key identification feature is a narrow, neon-orange stripe running along a dark triangular patch on the rear body. Under good aquarium lighting, this stripe glows intensely, giving the species its common name. They are occasionally confused with T. espei, which has a slimmer, more elongated dark marking.
Tank Setup
A shoal of ten can live comfortably in a 40-litre nano tank, though 60-80 litres allows for more natural schooling behaviour. Dense planting along the back and sides with open swimming space in the front suits them well. Floating plants such as Salvinia or Ceratopteris help diffuse light and create the dappled conditions these fish prefer. Dark substrates, whether aquasoil or fine gravel, make their copper glow far more visible than light-coloured sand.
Water Conditions
Glowlight rasboras thrive in soft, slightly acidic water: pH 5.5-7.0, GH 2-8, and temperature 24-28 degrees C. Singapore’s PUB tap water, once dechlorinated, is already quite close to ideal with its low GH of 2-4 and slightly acidic character. Adding Indian almond leaves or peat extract darkens the water to a light tea colour and further mimics their natural blackwater habitat. In Singapore’s warm climate, a heater is rarely necessary.
Feeding
These rasboras have tiny mouths and need appropriately sized food. Micro pellets of 0.5-1 mm, crushed flake, and live or frozen baby brine shrimp form an excellent diet. Daphnia and micro worms are eagerly accepted and provide useful variety. Feed small amounts twice daily. Their timid nature means they can be outcompeted by faster feeders at meal times, so observe carefully in community setups to ensure every fish gets its share.
Tank Mates
Pair glowlight rasboras with other small, peaceful species. Excellent companions include Boraras brigittae, pygmy corydoras (Corydoras pygmaeus), chocolate gouramis, and small shrimp like Neocaridina davidi. Avoid anything large enough to view them as food or boisterous enough to stress them into hiding. A species-only tank of 15-20 glowlights in a well-planted aquascape is a genuinely stunning setup that costs surprisingly little to establish.
Bringing Out the Best Colour
Colour intensity in T. hengeli depends heavily on environment and diet. Soft, tannin-stained water darkens the body background and makes the copper stripe pop. A varied diet rich in carotenoids, from foods like daphnia and colour-enhancing micro pellets, deepens the orange glow. Low to moderate lighting with a warm colour temperature (3000-4000K) also enhances their appearance. Under harsh, cool-white LEDs, they can look washed out and unimpressive.
Breeding
Breeding glowlight rasboras is challenging but possible. They are egg scatterers that deposit adhesive eggs on the underside of broad leaves, particularly Cryptocoryne species. Condition a pair with live foods for two weeks, then transfer them to a dimly lit 20-litre breeding tank with soft, acidic water at pH 5.5-6.0 and a temperature of 27 degrees C. Remove the adults after spawning, as they will eat the eggs. Fry hatch in 24-36 hours and need infusoria or liquid fry food for the first week.
A Nano Jewel Worth Keeping
For anyone seeking a peaceful, visually rewarding nano fish that thrives in Singapore tap water with minimal adjustment, the glowlight rasbora is hard to fault. This glowlight rasbora care guide should give you a strong starting point. Drop by Gensou Aquascaping to discuss nano tank designs that showcase these beautiful little fish at their finest.
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5 Everton Park #01-34B, Singapore 080005 · Open daily 11am – 8pm
