Top 10 Species of Loaches for Bottom-Dwelling Cleanup Crews
Curated by Kory White · Fractional CRO, CRO SyndicateDirect Answer
The **Kuhli Loach (*Pangio kuhlii*) is the #1 pick for a bottom-dwelling cleanup crew due to its nocturnal scavenging, small size (3–4 inches), and peaceful nature, ideal for planted community tanks. The Hillstream Loach (*Sewellia lineolata*)** is the runner-up, excelling in high-flow, cooler setups where it grazes on algae and biofilm.
These two species cover the widest range of tank conditions, from soft-bottom substrates to rocky river biotopes.
How We Ranked These
We evaluated species based on five criteria: efficiency at waste removal (eating leftover food, detritus, algae), tank compatibility (peacefulness with other fish and invertebrates), hardiness (tolerance to common beginner mistakes like ammonia spikes), size constraints (maximum adult length under 6 inches for typical home aquariums), and availability (consistent supply from reputable breeders or stores like Aquarium Co-Op or LiveAquaria).
Each species received a composite score out of 10, with higher weight on waste removal and compatibility. Real-world experience from forums like r/Aquariums and Practical Fishkeeping informed the rankings.
1. Kuhli Loach 🏆 BEST OVERALL
The Kuhli Loach is a slender, eel-like fish native to slow-moving streams in Southeast Asia. It reaches 3–4 inches in length and spends its days buried in soft sand or hidden under driftwood, emerging at night to sift through substrate for uneaten food, bloodworms, and small crustaceans.
Its small size and non-aggressive temperament make it perfect for tanks as small as 20 gallons, though a group of 5–6 is recommended for social comfort. Prices average $5–$8 per fish from Aquatic Arts or local stores.
Use Kuhlis when you have a planted tank with fine sand (not sharp gravel) and peaceful tankmates like tetras or rasboras. They excel at cleaning hard-to-reach corners and under decorations, reducing the need for manual gravel vacuuming. One drawback: they are shy and may hide for days after introduction, so provide plenty of cover like coconut caves or Java moss.
They are also sensitive to high nitrate levels (above 40 ppm), so weekly water changes of 25% are necessary.
2. Hillstream Loach
The Hillstream Loach (specifically *Sewellia lineolata*) is a flattened, sucker-mouthed fish adapted to fast-flowing rivers in Vietnam and China. It grows to 2.5–3 inches and uses its pectoral fins to cling to rocks and glass, grazing on soft algae (green spot, diatoms) and biofilm.
This is the best algae eater among loaches, capable of clearing a 30-gallon tank of surface algae in a week. Prices range $10–$15 from The Wet Spot Tropical Fish.
Deploy Hillstreams in high-flow tanks (e.g., with a Fluval 407 canister filter or powerhead) at 68–75°F water temperature. They thrive in river-tank setups with rounded stones and moderate lighting. They are compatible with most community fish but may be outcompeted for food by faster feeders like danios.
One key limitation: they cannot tolerate warm, stagnant water above 78°F, so they are unsuitable for discus or African cichlid tanks.
3. Yo-Yo Loach
The Yo-Yo Loach (*Botia almorhae*) is a robust, patterned fish from India and Pakistan, reaching 5–6 inches in length. It is named for the “yo-yo” pattern on its sides and is a voracious eater of snails, making it the go-to choice for snail infestations in planted tanks.
It also consumes leftover flakes and pellets. Prices are $6–$12 from LiveAquaria.
Use Yo-Yos in 40-gallon or larger tanks with a tight-fitting lid (they are known jumpers). They are semi-aggressive and will chase smaller fish like neon tetras, so pair them with medium-sized barbs or gouramis. They are active during the day, unlike most loaches, providing entertainment.
One caution: they can uproot delicate plants when digging for food, so use heavily rooted species like Anubias or Java fern.
4. Zebra Loach
The Zebra Loach (*Botia striata*) is a smaller relative of the Yo-Yo, growing to 3–4 inches, with striking black-and-white vertical stripes. It is less aggressive than the Yo-Yo and ideal for community tanks with peaceful fish. It scavenges for small insects, worms, and leftover food in the substrate.
Prices average $8–$10 from Imperial Tropicals.
Zebra Loaches thrive in groups of 5+ in a 30-gallon tank with soft sand and plenty of hiding spots (caves, PVC pipes). They are shy and may not eat for the first week; offer live blackworms to encourage feeding. They are cold-tolerant down to 65°F, making them suitable for unheated rooms.
One downside: they are prone to ich if stressed, so quarantine new arrivals for 2 weeks.
5. Clown Loach
The Clown Loach (*Chromobotia macracanthus*) is a large, colorful species from Indonesia, growing to 12 inches in captivity (up to 16 inches in the wild). It is a social fish that requires a group of 5+ and a 100-gallon minimum tank. It eats snails, worms, and prepared foods like Hikari Sinking Wafers.
Prices are $15–$25 for juveniles from Aquarium Co-Op.
Clown Loaches are best for large display tanks with robust filtration (e.g., Eheim Classic 600). They are long-lived (up to 20 years) and develop a humeral spine under the eye for defense. They are sensitive to ich and require stable water parameters: pH 6.0–7.5, temperature 78–86°F.
They are not for beginners due to size and disease susceptibility.
6. Dojo Loach 💎 BEST VALUE
The Dojo Loach (*Misgurnus anguillicaudatus*), also called the weather loach, is a hardy, eel-like fish from East Asia, reaching 6–10 inches. It is extremely tolerant of temperature swings (50–80°F) and poor water quality, making it ideal for unheated tanks or ponds.
It scavenges for worms, larvae, and detritus on the bottom. Prices are $4–$6 from Petco or PetSmart, making it the best value option.
Dojos are social and do best in groups of 3+ in a 40-gallon tank with smooth gravel (they burrow). They are known for “dancing” when atmospheric pressure changes, hence the “weather loach” name. They are compatible with goldfish but may eat small shrimp.
One issue: they can grow large and produce significant waste, requiring strong filtration like a Seachem Tidal 75.
7. Skunk Loach
The Skunk Loach (*Yasuhikotakia morleti*) is a small, active species from Thailand, growing to 3–4 inches. It has a distinctive black stripe along its back and is a relentless snail hunter, making it a top choice for snail control in 20-gallon tanks. It also eats live and frozen foods like brine shrimp.
Prices are $8–$12 from AquaBid.
Skunk Loaches are semi-aggressive and may nip fins of slow-moving fish like angelfish. They need a group of 4+ in a 20-gallon long tank with fine sand and driftwood for hiding. They are active during the day and will patrol the bottom constantly.
One caution: they are sensitive to copper-based medications, so treat diseases with Seachem Paraguard instead.
8. Dwarf Chain Loach
The Dwarf Chain Loach (*Ambastaia sidthimunki*) is a tiny species from Thailand, reaching only 1.5–2 inches. It is named for its chain-like pattern and is ideal for nano tanks (10 gallons minimum). It scavenges for micro-organisms and small food particles in the substrate. Prices are $10–$15 from The Wet Spot.
Dwarf Chain Loaches are very social and need a group of 6+ to feel secure. They are shy and require dense planting (e.g., Cryptocoryne wendtii) and leaf litter (Indian almond leaves) to mimic their blackwater habitat. They are sensitive to high nitrates (above 20 ppm) and need weekly 30% water changes.
They are compatible with shrimp like cherry shrimp.
9. Horseface Loach
The Horseface Loach (*Acantopsis choirorhynchos*) is a long-snouted species from Southeast Asia, growing to 8–10 inches. It spends most of its time buried in sand with only its eyes and snout exposed, emerging to eat worms and insect larvae. It is an excellent sand sifter, keeping the substrate aerated.
Prices are $8–$12 from LiveAquaria.
Horseface Loaches need a 75-gallon tank with deep sand substrate (3–4 inches) to burrow. They are shy and may not eat for weeks; offer live bloodworms to entice them. They are compatible with large community fish like rainbowfish but will eat small shrimp.
One key requirement: very low light (use Floating plants like Salvinia) to reduce stress.
10. Pond Loach
The Pond Loach (*Misgurnus anguillicaudatus*), often confused with the Dojo, is a wild-type variant that grows to 6–8 inches. It is extremely hardy and can survive in outdoor ponds with temperatures down to 40°F. It scavenges for algae, detritus, and small insects. Prices are $3–$5 from Koi dealers.
Pond Loaches are best for outdoor ponds or large indoor tanks (50+ gallons). They are nocturnal and will hide during the day. They are compatible with koi but may be eaten by large goldfish.
One caution: they can escape through small gaps in lids, so secure the tank with glass tops. They are not for planted tanks as they uproot plants.
FAQ
What is the best loach for a 10-gallon tank? The Dwarf Chain Loach is the only loach suitable for a 10-gallon tank, but you need a group of 6, which may be cramped. A better option is the Kuhli Loach in a 20-gallon.
Do loaches eat shrimp? Most loaches will eat small shrimp like cherry shrimp if given the chance. The Dwarf Chain Loach is the safest bet for a shrimp tank, but even they may prey on baby shrimp.
Can loaches live with bettas? Generally no, as bettas are territorial and loaches are active. The Kuhli Loach is the only exception, as it is nocturnal and stays at the bottom, but a 20-gallon tank is needed to minimize conflict.
How many loaches should I keep together? All loaches are social and need groups of at least 5–6. Lone loaches become stressed and hide constantly.
What is the lifespan of a loach? Small species like Kuhlis live 5–8 years, while larger ones like Clown Loaches can live 15–20 years with proper care.
Do loaches need a heater? Most tropical loaches need 74–82°F water. The Dojo Loach and Pond Loach are exceptions and can live in unheated tanks down to 50°F.
Sources
- Kuhli Loach care guide - Aquarium Co-Op
- Hillstream Loach profile - Seriously Fish
- Yo-Yo Loach snail control - LiveAquaria
- Clown Loach size and tank requirements - Practical Fishkeeping
- Dojo Loach hardiness - Petco
- Dwarf Chain Loach nano tank suitability - The Wet Spot
- Loach compatibility chart - r/Aquariums
Bottom Line
For most aquarists, the Kuhli Loach offers the best balance of size, temperament, and waste removal, while the Hillstream Loach is unmatched for algae control in high-flow tanks. Always match the species to your tank’s volume, temperature, and tankmates to ensure a healthy cleanup crew.
*Top 10 Species of Loaches for Bottom-Dwelling Cleanup Crews*