Yellowfin Hillstream Loach

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The Yellowfin Hillstream Loach is a fascinating freshwater algae-grazing fish with a distinctive flattened body, specialised sucker-like fins and attractive yellow-toned fins. Its unusual appearance makes it a standout addition to well-established freshwater aquariums.

Hillstream Loaches originate from fast-flowing, highly oxygenated streams and are adapted to cling tightly to rocks and other surfaces. They spend much of their time grazing on algae and biofilm across aquarium glass, rocks, wood and other surfaces.

A mature aquarium with plenty of natural biofilm, strong oxygenation and good water movement is important for long-term success. Smooth rocks, driftwood and broad surfaces provide valuable grazing areas and hiding places.

They are peaceful community fish and can be kept with other peaceful species that appreciate similar cool, well-oxygenated conditions. They can also work well in carefully planned shrimp aquariums.

Quick Care Guide

• Scientific Name: Sewellia sp.
• Common Name: Yellowfin Hillstream Loach
• Family: Gastromyzontidae
• Type: Freshwater algae grazer
• Adult Size: Approximately 5–7 cm
• Temperament: Peaceful
• Care Level: Moderate
• Minimum Aquarium: 60 litres
• Temperature: 20–25°C
• pH: 6.5–7.8
• Water Hardness: Soft to moderately hard
• Diet: Algae, biofilm, algae wafers and supplemental vegetables
• Tank Level: Bottom and aquarium surfaces
• Group Size: 3–6+
• Flow: Moderate to strong
• Oxygen: High
• Suitable For: Mature planted and river-style aquariums
• Substrate: Smooth sand or fine gravel recommended

Frequently Asked Questions

Do Yellowfin Hillstream Loaches eat algae?

Yes. They naturally graze on algae and biofilm growing on rocks, glass and aquarium décor. They should also receive supplemental food when natural algae is insufficient.

Do they need strong water flow?

They benefit from good water movement because they naturally inhabit fast-flowing streams. Strong oxygenation is particularly important.

Can they live with shrimp?

Yes. They are peaceful and generally compatible with freshwater shrimp. They may occasionally consume extremely small organisms while grazing, but they are not active shrimp predators.

Can they be kept with tropical fish?

They are best kept with peaceful species that tolerate similar temperatures and highly oxygenated water. Very warm-water species are not ideal long-term tankmates.

Do they need a mature aquarium?

Yes. A mature aquarium is strongly recommended because it provides natural algae and biofilm for grazing.

Do they need to be kept in groups?

They can be kept individually, but a small group allows more natural social behaviour and provides additional interest in the aquarium.

Common Mistakes

• Adding them to a brand-new aquarium with little natural biofilm.
• Keeping them in warm, poorly oxygenated water.
• Providing insufficient water movement.
• Assuming they can survive entirely on algae in the aquarium.
• Keeping them with aggressive or highly competitive tankmates.
• Allowing excessive waste or poor water quality to build up.