Kuhli Loach Care Guide
3 min read · Updated Jun 2026
Kuhli loaches (Pangio kuhlii) are peaceful, eel-like bottom dwellers that wriggle through planted tanks like tiny snakes. Keep them in a group over sand and they go from shy hiders to active, charming foragers.
In this guide
Species Snapshot
- Tank size
- 20+ gallons
- Temperature
- 73-86°F
- pH
- 5.5-7.0
- GH
- 3-10 dGH
- Difficulty
- Beginner
- Lifespan
- 10 years
- Adult size
- 3-4 in
- Diet
- Omnivore
Kuhli loaches look like tiny eels and behave like a secret society — when you keep too few, you may go days without seeing one. Keep a proper group over a soft sand bed, and they transform into one of the most charming, active bottom-dwelling fish you can own.
What you need
The two things that make or break a kuhli loach tank are a soft sand substrate and a group of at least six. Get those right and the rest is standard tropical care.
CaribSea Super Naturals Aquarium Sand
Inert, pH-neutral substrate — safe for any livestock and easy to clean.
A fine, smooth sand lets kuhlis sift and burrow naturally and protects the sensitive barbels around their mouths. Sharp gravel does the opposite.
Tank size and setup
A 20 gallon long is an ideal starting size — the extra floor space matters far more than height for a bottom dweller. Provide plenty of hiding spots: driftwood, caves, leaf litter, and dense plants. Counterintuitively, the more secure hiding spots they have, the more time they spend out in the open.
AquaClear 30 Power Filter
Customizable hang-on-back filtration with excellent mechanical and biological media space.
Kuhlis are escape artists and can slip into uncovered intakes, so a pre-filter sponge or a gentle filter is wise. Always keep a tight lid — they will find any gap.
Water parameters
Kuhli loaches are flexible: 73-86°F, pH 5.5-7.0, and a soft to moderate GH of 3-10. They prefer slightly soft, warm water. As scaleless fish, they are a bit more sensitive to medications and poor water quality, so keep up with water changes.
Eheim Jager 100W Heater
Holds a steady temperature in 20–29 gallon tanks even in cool rooms.
Diet and feeding
Kuhli loaches are omnivorous scavengers, but do not rely on them to live off "leftovers" alone. They need their own food that reaches the bottom:
- Sinking pellets and wafers
- Frozen bloodworms and brine shrimp
- Crushed flake that sinks into the sand
They feed mostly at night, so an evening feeding ensures they get their share before faster fish clean up.
Common mistakes
- Keeping only one or two, so they hide permanently and look "boring"
- Using sharp gravel that damages their barbels
- Leaving gaps in the lid or an open filter intake they can climb into
- Adding them to a brand-new, uncycled tank
Tank mates
Kuhli loaches are completely peaceful and pair beautifully with other calm community fish — chili rasboras, small tetras, corydoras, and dwarf shrimp (adults). Avoid large or aggressive fish that might see a kuhli as a snack or stress them out of sight.
Building a community tank?
Use our Tank Builder to spec a 20-gallon community setup — tank, filter, heater, light, and sand-friendly substrate.
Build my tank kit →Behavior and what to expect
Expect a settling-in period. New kuhlis often vanish for days while they learn the tank is safe. A confident group eventually forages in the open, piles together in "kuhli knots," and even free-swims up the glass at feeding time.
Recommended products
Anubias Nana (Potted)
Nearly indestructible low-light plant — tie it to hardscape and ignore it.
Seachem Prime Water Conditioner
The gold standard dechlorinator — also detoxifies ammonia and nitrite during cycling.
Give kuhli loaches a sandy floor, a confident group, and a planted tank with hiding spots, and you will be rewarded with a decade of quirky, eel-like activity.