Green Body Gastromyzon Hillstream Loach

Green Body Gastromyzon Hillstream Loach (Gastromyzon lepidogaster)

An extremely rare green body hillstream loach with collector appeal, natural algae-grazing behavior, and the iconic Borneo sucker body shape.

The Green Body Gastromyzon Hillstream Loach is a rare colour form of Gastromyzon lepidogaster, a specialized hillstream loach also searched as Green Borneo Sucker, Green Hillstream Loach, Borneo Sucker Loach, and rare Gastromyzon. With its flattened body, strong gripping ability, and green-toned patterning, this fish is one of the most unusual freshwater loaches available to collectors in Canada.

Unlike common algae eaters, Gastromyzon are not ordinary bottom fish. They are river-style specialists built for clean, oxygen-rich water, mature surfaces, and constant grazing on glass, stones, driftwood, and smooth hardscape. The green body form gives this fish a much stronger collector identity than standard hillstream loaches.

We also offer a Pink Body form of Gastromyzon lepidogaster. Care, tank setup, feeding, and temperament are the same; the difference is the body colour and visual presentation.

Why this fish stands out

• Extremely rare green body form of Gastromyzon lepidogaster
• Also known as Green Borneo Sucker or Green Hillstream Loach
• Specialized flattened body built for gripping rocks and glass
• Active grazer for biofilm, soft algae, and natural surface growth
• Excellent for mature planted tanks, river-style aquariums, and collector setups
• Peaceful, unusual, and very different from common algae eaters

Best for

• Hillstream loach collectors
• Rare freshwater fish collectors
• High-oxygen planted aquariums
• River-style aquarium setups
• Aquascapes with smooth stones, wood, and mature biofilm
• Customers looking for a rare algae-grazing fish that is not a pleco

Topick Aquarium Insight

Green Body Gastromyzon should not be treated like a simple “cleaner fish.” The biggest difference between success and failure is not whether the fish eats algae — it is whether the aquarium is mature, oxygen-rich, clean, and stable.

Many customers search for hillstream loaches because they want algae control, but Gastromyzon are better understood as specialized river fish. They constantly graze surfaces, but they still need prepared foods, mature biofilm, and stable conditions to maintain body weight.

A healthy Gastromyzon should have a full body, strong grip, steady breathing, and active grazing behavior. Thin hillstream loaches are often underfed, even when algae is visible in the aquarium.

Green Body vs Pink Body Gastromyzon

Green Body and Pink Body Gastromyzon are cared for the same way. Both should be treated as rare Gastromyzon lepidogaster hillstream loaches that need clean, mature, oxygen-rich water.

• Green Body: stronger green or metallic green body impression, ideal for collectors seeking the classic Green Borneo Sucker look
• Pink Body: lighter warm pink body tone, ideal for customers who want a softer and more unusual colour form

The choice is mainly visual. Tank setup, feeding, temperament, and long-term care are the same.

Behavior & Group Size

Green Body Gastromyzon are peaceful bottom-dwelling river loaches. They spend most of their time attached to glass, stones, wood, and hardscape while grazing biofilm and soft algae.

They can be kept singly, but they are more interesting in groups. We recommend 3 or more when possible, and 5 or more in larger river-style aquariums. Mild chasing or positioning behavior can happen around favourite grazing spots, but this is usually normal hillstream loach behavior.

Tank Setup

This fish is best kept in a mature aquarium with strong oxygenation and plenty of surface area for grazing. A new tank with no biofilm is not ideal.

• Minimum recommended tank: 20 gallons long or larger
• Mature aquarium strongly recommended
• High oxygenation and clean water are essential
• Moderate to strong flow preferred
• Smooth stones, driftwood, and glass provide grazing surfaces
• Bright lighting can help grow natural algae and biofilm
• Secure lid recommended

A river-style layout with smooth rocks, open flow, and established biofilm is ideal. Avoid dirty, low-oxygen aquariums or tanks with unstable parameters.

Water Parameters

• Scientific Name: Gastromyzon lepidogaster
• Common Names: Green Body Gastromyzon, Green Borneo Sucker, Green Hillstream Loach, Borneo Sucker Loach
• Temperature: 20–24°C preferred; slightly warmer only with strong oxygenation
• pH: 6.5–8.0
• Adult Size: approximately 4–6 cm in aquarium trade
• Temperament: Peaceful / mildly territorial around grazing spots
• Diet: Biofilm, soft algae, aufwuchs, algae-based foods, small frozen foods
• Care Level: Intermediate

Stable, oxygen-rich water is more important than chasing exact numbers. Avoid high temperatures without strong aeration, because warm water holds less oxygen and can stress hillstream loaches.

Feeding

Green Body Gastromyzon graze constantly, but they should not be expected to survive on aquarium algae alone. In many clean aquariums, natural algae is not enough to support long-term body condition.

• Natural biofilm and soft algae
• Algae wafers
• Spirulina-based sinking foods
• Repashy-style gel foods on rocks
• Fine sinking foods
• Frozen daphnia, cyclops, brine shrimp, or bloodworms in moderation

The best feeding method is to provide food where they naturally graze. Soft gel food or algae-based food placed on smooth stones can help newly introduced fish feed more confidently.

Tank Mates

Best tank mates are peaceful fish that enjoy clean, well-oxygenated water and do not aggressively compete on the bottom.

• White Cloud Mountain Minnows
• Danios
• Small peaceful barbs
• Peaceful gobies
• Other compatible hillstream loaches
• Small to medium peaceful community fish in cooler, oxygen-rich setups

Avoid aggressive cichlids, large predators, very warm low-flow tanks, and bottom fish that aggressively compete for the same grazing areas.

Canada-Wide Live Fish Shipping

Green Body Gastromyzon Hillstream Loach is available from Topick Aquarium in Canada when in stock. Local pickup is available in Markham, Ontario, and Canada-wide live fish shipping may be available depending on weather, route, and livestock condition.

Important Note

Green Body Gastromyzon is not a pleco and should not be sold or kept as a simple replacement for a pleco. It is a specialized hillstream loach that needs oxygen, flow, mature surfaces, and regular feeding.

This fish may graze algae, but it is not a solution for every algae problem. For black beard algae, staghorn algae, or heavy long hair algae, the root cause usually involves lighting, nutrient balance, flow, CO2 stability, or maintenance habits.

FAQ

Is Green Body Gastromyzon the same as a hillstream loach?
Yes. It is a rare Gastromyzon hillstream loach, also searched as Green Borneo Sucker, Green Hillstream Loach, Borneo Sucker Loach, or rare algae-eating loach.

What is the scientific name?
The scientific name is Gastromyzon lepidogaster.

Is Green Body Gastromyzon rare?
Yes. Green Body Gastromyzon lepidogaster is much less commonly offered than standard hillstream loaches and should be treated as a rare collector fish.

Is it a good algae eater?
It is a natural biofilm and soft algae grazer, but it should not be expected to live on algae alone. For long-term success, feed algae-based sinking foods and provide mature grazing surfaces.

Does it need strong flow?
It does best in clean, oxygen-rich water with moderate to strong flow. Strong aeration and stable water are more important than simply blasting the aquarium with current.

Can it live in a normal tropical community tank?
Only if the tank is mature, clean, well-oxygenated, and not too warm. Very warm, low-flow, low-oxygen aquariums are not recommended.

What is the difference between Green Body and Pink Body Gastromyzon?
Care is the same. Green Body has a stronger green or metallic tone, while Pink Body has a lighter warm pink body appearance.

Can I keep only one?
Yes, but groups are more active and interesting. We recommend 3 or more when possible.

Is it safe with shrimp?
Yes, it is generally peaceful with freshwater shrimp. Very tiny shrimplets may still be vulnerable in any community aquarium, but Gastromyzon are not active shrimp hunters.