Product Details

Borneo Sucker Yellow Lazer Loach – Gastromyzon lepidogaster

The Borneo Sucker Yellow Lazer Loach is a specialist freshwater hillstream loach with a flattened body, strong sucker-like fins and attractive yellow-toned patterning. More accurately listed as Gastromyzon lepidogaster, this species is also known as the Green Borneo Sucker, Borneo Sucker Loach, Yellow Laser Borneo Loach or Lepidogaster Hillstream Loach. It is best suited to mature river-style aquariums with strong flow, high oxygen levels, smooth stones and established biofilm growth.

Key Identification:

Common Name: Borneo Sucker Yellow Lazer Loach
Other Names: Yellow Laser Borneo Loach, Green Borneo Sucker, Borneo Sucker Loach, Lepidogaster Hillstream Loach
Scientific Name: Gastromyzon lepidogaster
Strain / Form: Yellow Lazer / Yellow Laser trade colour form
Fish Type: Hillstream Loach / Borneo Sucker Loach
Water Type: Freshwater

Natural Range & Habitat:

Gastromyzon lepidogaster is a Borneo hillstream loach associated with clear, fast-flowing upland streams and shallow rocky habitats. These environments are typically cool to moderately warm, highly oxygenated and rich in smooth stones, exposed rock surfaces, gravel and natural biofilm.

In the aquarium, this species should be kept in a mature river-style setup with strong water movement, excellent oxygenation and clean, stable water. It should not be placed in newly established aquariums, warm low-flow community tanks or setups with poor surface agitation.

Appearance & Adult Size:

Borneo Sucker Yellow Lazer Loaches have a flattened body shape with broad pectoral and pelvic fins that allow them to cling tightly to stones, glass and wood in moving water. Body colour is usually dark olive, brown, grey or greenish-brown, with lighter yellow, cream or golden markings depending on the individual and trade form.

Adults usually reach around 5–6 cm. Colour intensity, yellow patterning, body tone and fin markings can vary naturally between individuals, collection locality, mood and aquarium conditions.

Aquarium Suitability:

This is a specialist freshwater loach for mature, well-oxygenated aquariums. It is peaceful and fascinating to watch, but it should not be treated as a general tropical community fish or basic “algae eater”.

The aquarium should be arranged with smooth river stones, rounded pebbles, driftwood, strong filtration and clear water movement. Moderate to bright lighting can help encourage natural algae and biofilm growth on hard surfaces, while shaded resting areas should also be available.

Recommended Aquarium Size:

A practical minimum is 75–90 litres for a small group, with a longer aquarium preferred over a tall one. Larger aquariums of 120 litres or more are better for stable flow, oxygenation and group behaviour.

Keep in groups of 3 or more, with 5 or more preferred where space allows. Keeping them in groups encourages more natural behaviour and reduces stress, provided there are enough stones, grazing areas and resting sites.

Water Conditions:

Temperature: 20–24°C
pH: 6.5–7.8
Hardness: Soft to moderately hard water
Additional Notes: High oxygen levels and strong water movement are essential. Keep nitrate low and avoid warm, stagnant or poorly filtered aquariums. This species is not suitable for tropical tanks kept constantly at high temperatures. Mature biofilm growth on stones and wood is highly beneficial.

Temperament & Tank Mates:

Aquarium Category: Community Fish

Borneo Sucker Yellow Lazer Loaches are peaceful and usually ignore other fish. They may lightly spar with each other over favourite stones, but this is normally harmless if enough space and cover are provided.

Suitable tank mates include White Cloud Mountain Minnows, hillstream-suitable danios, peaceful rasboras that tolerate cooler flowing water, small gobies from similar habitats, other compatible hillstream loaches with care and peaceful freshwater shrimp only if breeding is not a priority. Avoid goldfish, large cichlids, warm-water discus, angelfish, slow gouramis, aggressive loaches, fin-nippers and any fish that requires still, warm or low-oxygen water.

Feeding:

This species grazes on biofilm, soft algae, aufwuchs and tiny food particles from stones and hard surfaces. Natural grazing should be supported with a mature aquarium and algae-covered rocks.

Offer sinking algae wafers, spirulina tablets, gel foods, blanched courgette, cucumber, spinach, Repashy-style aufwuchs foods and fine sinking pellets. Occasional frozen foods such as daphnia, cyclops or brineshrimp can be offered, but the diet should remain rich in plant-based and biofilm-style foods. Do not rely on aquarium algae alone.

Behaviour in the Aquarium:

This loach spends much of its time attached to stones, glass or wood, grazing surfaces with short movements. It may move quickly between rocks and often chooses areas with good current.

When settled, individuals can become surprisingly visible, especially around feeding time or on favourite grazing stones. They may rest flat against surfaces and use their broad fins to hold position against flow.

Care Notes:

Provide strong aeration, excellent filtration and regular water changes. A river manifold, powerhead, spray bar or additional flow pump can help create the water movement this species prefers.

Avoid sharp gravel, dirty substrate, low oxygen and high temperatures. Make sure food reaches the bottom and that faster midwater fish do not take everything first. Do not add to immature aquariums with no established biofilm. Stable water quality is more important than chasing extreme parameters.

Recommended For:

Intermediate freshwater aquarists

Availability:

Occasional / Specialist freshwater import

Image Disclaimer:

All images are a visual representation of the fish you will receive, made to be as accurate as possible. Natural variation in size, yellow lazer patterning, green-brown body tone, pale markings, fin shape and markings can occur between individual fish.