A flattened, sucker-bodied loach built to cling to rocks in fast torrents, sporting a striking reticulated leopard pattern. Demands cool, highly oxygenated, fast-flowing water and a biofilm-covered hardscape.
ℹ️
Educational only. KinStation content is reviewed by licensed veterinarians but cannot replace an in-person exam. Always consult a licensed veterinarian or board-certified specialist for diagnosis, treatment, or any decision affecting your pet's health.
🩺 Need expert help with your hillstream loach?
Connect with a specialist near you or ask a licensed vet — never substitute online guidance for hands-on care in an emergency.
Bottom-dwelling, often social fish prized for sifting substrate, controlling pest snails, and adding constant motion to the lower levels of the aquarium. Most are scaleless or fine-scaled and sensitive to medications.
From the minimum an animal needs to be kept humanely, up to the ideal setup. Bigger is almost always better — minimums are floors, not targets.
Photo coming soon
Minimum
Cool-flow species tank
20 gal / 76 L long
Sewellia and Beaufortia species need cool (18–24 °C) highly oxygenated water with strong current. 20-gal long minimum for a small group of 3+, with smooth river rocks, sand, powerheads, and biofilm for grazing.
Photo coming soon
Recommended
Hill-stream display
29 gal / 110 L long
29-gal long with multiple powerheads for strong directional flow, smooth river rocks, sand, biofilm, and a group of 4–6. Cool water and oxygenation are the critical parameters.
Photo coming soon
Ideal
Hill-stream biotope
40 gal+ / 151 L+ biotope
SE Asian hill-stream biotope with very strong directional current, smooth river rocks, sand, cool oxygenated water, and a group of 6+. Closest to wild fast-water habitat.
Life & growth stages
How this animal changes through its life — each stage often has its own care, diet and space needs.
Photo coming soon
Egg
Fish eggs are small, translucent spheres, often laid in clutches on plants, substrate, or in a nest — or carried/brooded by a parent in livebearing and mouth-brooding species. A dark eye spot and the curled embryo become visible inside as development progresses.
Photo coming soon
Fry
Newly hatched fry are tiny and semi-transparent, frequently still carrying a yolk sac that fuels them before they feed freely. They lack full fin structure and adult coloration, staying near cover until they can swim and forage on their own.
Photo coming soon
Juvenile
Juveniles look like miniature adults but with developing fins and muted or different markings; many species shift pattern and color as they mature. Growth is rapid at this stage given clean water and steady feeding.
Adult
Adults show the species' full size, finnage, and mature coloration, and are sexually mature. Many fish develop sex-specific differences in size, color, or fin shape, which can intensify during breeding.
Habitat & enclosure
Keep a group in a tank of at least 20-30 gallons with strong laminar current and surface agitation. They need cool, oxygen-saturated water at 68-75 F (20-24 C), pH 6.5-7.5, and soft to moderately hard water; sustained high temperatures stress them. Bright lighting is beneficial because it grows the algae and biofilm they graze.
They inhabit shallow, rocky riffles in central Vietnam, so a 'river-tank' setup with vigorous flow is the goal.
Substrate
Aquascape with smooth river rocks, cobbles, and large pebbles over sand to mimic a streambed and provide grazing surfaces. Let algae and biofilm establish on the hardscape before introducing the fish.
Equipment & setup
Pair a strong filter with one or more powerheads or a wavemaker to create river-like current and high oxygenation; a chiller may be needed in warm climates to hold temperatures down. Bright lighting promotes the algal film they eat.
Diet
Primarily an aufwuchs grazer, rasping algae and biofilm off rocks. Supplement with algae wafers, blanched vegetables, and small frozen foods like bloodworms and brine shrimp. A well-lit, mature tank with natural algal growth is the best food source.
Behavior & temperament
Peaceful and fascinating to watch as they dart and cling to glass and stone. Mildly territorial over grazing spots but harmless; keep several so they can spread out. Ideal tankmates are other cool-water, current-loving species such as white cloud mountain minnows and small danios; avoid warm-water or aggressive fish.
Health
Most failures come from insufficient oxygen, low flow, or too-warm water rather than disease. They are sensitive to poor water quality and to copper-based medications. Starvation is a risk in sterile new tanks lacking biofilm.
Tips, DIY & hacks
Mature the tank for weeks so biofilm and algae develop before adding them. They breed readily in groups given strong flow, clean water, and good feeding. Run them in a dedicated 'river tank' with cool-water companions for the best results.
