Kuhli Loach (Pangio kuhlii)

The Kuhli Loach (Pangio kuhlii) is the friendly little eel of the freshwater world: a slender, banded, almost snake shaped loach that spends its day tucked under driftwood and its evening wriggling across the sand in a group. They are peaceful, beginner friendly, genuinely long lived, and they bring a kind of movement to the bottom of a tank that nothing else quite matches. Keep six or more and you get a proper writhing pile of them at feeding time. Browse the rest of our freshwater livestock and supplies to build out the tank.

Care Guide

• Group size: six or more. Kuhlis kept alone or in pairs hide permanently and you will barely see them. In a real group they relax, come out earlier, and pile together in the same favorite cave.
• Tank size: 20 gallons, with a long footprint preferred over a tall one. Floor space matters more than volume.
• Substrate is the one thing to get right: soft sand or very smooth fine gravel. They burrow and sift, and sharp gravel wears down their barbels and leads to infections. Aquarium sand is the safest choice.
• Aquascape: caves, live plants, driftwood, and a layer of catappa leaves. Give them more hiding spots than you think they need, because confident fish come out more.
• Water parameters: 75 to 82°F, pH 6.0 to 7.0, soft to moderately hard. Stable matters more than exact.
• Feeding: omnivore and a bottom feeder. Sinking wafers, pellets, and frozen foods work well. They are slow, unhurried eaters, so drop food in after the lights go out to make sure they get their share instead of the fast fish upstairs.
• Escape artists: a tight fitting lid is required, and so is covering your filter intake. Kuhlis are famous for finding their way up into hang on back filters and canister intakes. A coarse sponge over the intake solves it.
• Scaleless, so medicate carefully: never use aquarium salt or copper based treatments, and use half the labeled dose of any medication. This is the single most common way people lose kuhlis.

Specifications

Compatibility

Great with: almost any peaceful community fish that lives above them. Neon Tetras, Ember Tetras, Rummy Nose Tetras, Kubotai Rasboras, Celestial Pearl Danios, and Honey Gouramis all make excellent upstairs neighbors. Down on the bottom they share space happily with Sterbai Corys, Pygmy Corys, and Otocinclus.

Also fine with: Amano Shrimp and nerite snails. Kuhlis are far too small mouthed to bother adult shrimp, and unlike their larger cousins they will not hunt down your ornamental snails.

Avoid: cichlids and anything large enough to see a 3 inch worm shaped fish as a snack, plus fast aggressive feeders that will strip the bottom clean before the loaches arrive. Also skip tanks that are dosed with salt as a routine, since kuhlis cannot tolerate it.

Recommended Foods & Supplies

• Hikari Sinking Wafers, an easy staple that reaches the bottom intact
• Fluval Bug Bites Bottom Feeder Formula, insect based sinking granules
• Hikari Frozen Tubifex Worms, the treat that brings them straight out of hiding
• Aquarium sand, the correct substrate for burrowing loaches
• Fritz Catappa Leaves, natural cover plus a gentle tannin boost

FAQ

I added them and now I cannot find any. Did they die?
Almost certainly not. New kuhlis will vanish under the substrate or into the rockwork for days, sometimes a couple of weeks. They come out on their own schedule once they feel safe, and a larger group plus plenty of cover speeds that up a lot. Feeding after lights out is the fastest way to coax them into the open.

Is this really Pangio kuhlii?
Honest answer: probably not, and that is true of nearly every Kuhli Loach sold anywhere. Pangio kuhlii is the name the trade has used for a century, but most banded kuhlis exported today are Pangio semicincta, with a few other Pangio species mixed in. Care is identical across all of them, so nothing changes for your tank. We list them under the trade name that everyone recognizes.

Will they eat my pest snails?
No. That is their bigger relatives, like the Yo Yo Loach and Clown Loach. Kuhlis have small, soft mouths built for sifting sand, which is exactly why they are safe with ornamental snails and shrimp.

Can I keep just two or three?
You can, but you will not enjoy them. Kuhlis in small numbers stay hidden almost permanently. Six is the practical minimum for a group that actually behaves like kuhlis, and more is better.

Why can I not treat them like my other fish?
They are scaleless, so anything that crosses skin hits them harder. Aquarium salt and copper based medications are genuinely dangerous to them, and standard treatments should be given at half strength. Always plan medications around the kuhlis in a mixed tank.