Hillstream Loach
Sewellia lineolata
Minimum Tank
20 Gallons
Adult Size
3 inches
Temperature
68-75°F (20-24°C)
pH Range
6.5-7.5
Lifespan
8 years
School Size
3+ fish
About Hillstream Loach
The hillstream loach is a fascinating, flat-bodied fish adapted to life in fast-flowing, oxygen-rich mountain streams of Southeast Asia. Its body is dorsoventrally flattened with broad, suction-cup-like pelvic and pectoral fins that allow it to cling to smooth rocks in torrential currents. From above, it resembles a tiny stingray or a manta ray. Hillstream loaches are primarily algae and biofilm grazers that methodically work their way across every surface in the tank. They require specialized conditions that replicate their fast-flowing natural habitat, which makes them best suited for experienced keepers who can provide adequate water movement and oxygenation. Their unique appearance and interesting behavior make them a rewarding challenge.
Care Requirements
Tank Setup
- • Minimum 20-gallon tank required
- • Temperature: 68-75°F (20-24°C)
- • pH: 6.5 - 7.5
- • Category: Loach
Diet & Feeding
- • Diet type: Herbivore
- • Feed 1-2 times daily
- • Varied diet recommended
Tank Mate Compatibility
Compatible With
Avoid Keeping With
Care Tips
Expert Tips
Hillstream loaches need cool, fast-flowing, highly oxygenated water at 64-75°F, which sets them apart from most tropical community fish. Provide smooth river rocks, a powerhead or strong filter output for current, and lots of surfaces for biofilm and algae growth. They are best kept in a river-manifold style setup designed specifically for rheophilic species. Feed algae wafers, blanched vegetables, and sinking foods placed in the current. Keep them in groups of at least three and provide ample smooth surfaces for grazing territory. Avoid housing with fish that prefer warm, still water. Regular water changes are essential to maintain the pristine conditions they require.
Quick Facts
76L
Min Tank (20gal)
8cm
Adult Size (3")
8yr
Lifespan
3+
Min School
Build Your Perfect Community Tank
Find compatible tankmates for your Hillstream Loach
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Tank Mates for Hillstream Loach
Species from our database with overlapping water parameters, compatible temperaments and a realistic shared tank size.
Longfin Zebra Danio
Danio rerio var.
easy · 10+ gal
White Cloud Mountain Minnow
Tanichthys albonubes
easy · 10+ gal
Rubber Lip Pleco
Chaetostoma sp.
moderate · 20+ gal
Checker Barb
Oliotius oligolepis
easy · 20+ gal
Similar Care Level
Other moderate-care species that suit a comparable setup.
Frequently Asked Questions
What size tank does a Hillstream Loach need?
A Hillstream Loach needs a minimum tank size of 20 gallons (76 litres). They should be kept in schools of at least 3.
What water parameters does a Hillstream Loach need?
Hillstream Loach thrive in water between 68-75°F (20-24°C) with a pH of 6.5-7.5.
Are Hillstream Loach easy to care for?
Hillstream Loach are considered moderate to care for. They are peaceful fish with a lifespan of about 8 years.
How big do Hillstream Loach get and what do they eat?
Hillstream Loach reach about 3 inches and are herbivores. Hillstream loaches need cool, fast-flowing, highly oxygenated water at 64-75°F, which sets them apart from most tropical community fish. Provide smooth river rocks, a powerhead or strong filter output for current, and lots of surfaces for biofilm and algae growth. They are best kept in a river-manifold style setup designed specifically for rheophilic species. Feed algae wafers, blanched vegetables, and sinking foods placed in the current. Keep them in groups of at least three and provide ample smooth surfaces for grazing territory. Avoid housing with fish that prefer warm, still water. Regular water changes are essential to maintain the pristine conditions they require.