Jingxi Yunnan loach
Yunnanilus jinxiensis
The Jingxi Yunnan loach features a slender, elongated body with prominent barbels and a mottled brown coloration, aiding in camouflage among river substrates.
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About the Jingxi Yunnan loach
This is a small Chinese stone loach from Guangxi, and its whole vibe is "hang out on the bottom and poke around". It comes from a pretty specific local area (Jingxi County), so you are not likely to see it in the regular aquarium trade. If you do run into one, think cool, clean, well-oxygenated water and lots of hiding spots like you would for other little nemacheilid loaches.
Also known as
Quick Facts
Size
7.2 cm
Temperament
Peaceful
Difficulty
Advanced
Min Tank Size
20 gallons
Lifespan
3-6 years
Origin
China (Guangxi, Pearl River drainage)
Diet
Micro-predator/omnivore - small sinking foods, frozen foods (bloodworms, brine shrimp), live foods
Water Parameters
18-24°C
6.5-7.5
3-12 dGH
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This species needs 18-24°C in a 20 gallon tank. Use our heater calculator to find the right wattage.
Calculate heater sizeCare Notes
- Give them a long, low tank with a steady current - think stream vibes. Pile in rounded river stones, cobbles, and a few tight crevices because they spend a lot of time wedged into cover.
- They do best in cool-ish, oxygen-rich water: about 64-72F (18-22C), pH roughly 6.5-7.5, and low-to-moderate hardness. What they really hate is warm, stale water and swings after big sloppy water changes.
- Run strong filtration plus extra aeration, and point a powerhead along the bottom so food and detritus dont just sit there. Keep the substrate clean because these guys are constant bottom browsers and gunk leads to quick barbel and skin issues.
- Feed like you are feeding a shy micro-predator: small sinking foods (micro pellets, crushed wafers) and lots of frozen/live stuff like bloodworms, daphnia, cyclops, and baby brine. Scatter it in multiple spots after lights dim a bit or the faster fish will steal everything.
- Keep them in a group (6+ if you can) or they stay hidden and get weirdly jumpy. They are peaceful with other cool-water stream fish like small danios/white clouds and other non-bullying loaches, but skip aggressive barbs and big hungry bottom fish.
- They can be nippy or pushy with similar-shaped bottom dwellers in tight tanks, so give plenty of floor space and line-of-sight breaks. Avoid mixing with delicate long-finned fish that sleep on the bottom.
- Watch for jumping - they are surprisingly good at finding gaps when startled, so a tight lid is non-negotiable. Also keep an eye out for rapid breathing or hanging in the flow, which usually means low oxygen or the tank ran too warm.
- Breeding is possible but not a casual community-tank thing: cool water, heavy feeding, and then a fresh cooler water change can trigger spawning behavior. If you see eggs, pull adults or move eggs to a separate box because they will absolutely snack on them.
Compatibility
Good Tankmates
- Small, chill midwater schoolers like ember tetras, glowlight tetras, or rasboras (they ignore the loaches, and the loaches just do their little bottom-scuttle routine)
- White cloud mountain minnows or other cool-ish water community fish (nice vibe match if you keep things on the cooler side and give the loaches flow and hiding spots)
- Other peaceful micro fish like small danios or ricefish (active but not nasty, and they do not compete much for the bottom caves)
- Gentle bottom buddies like kuhli loaches or small Corydoras (as long as the tank has enough floor space and you feed in multiple spots so nobody gets outcompeted)
- Small, non-territorial hillstream-type tank mates like Sewellia or Gastromyzon (works best in a riffle-style setup with flow, smooth rocks, and lots of oxygen)
- Peaceful dwarf shrimp and snails (usually fine since Jingxi Yunnan loaches are pretty mild, but expect the occasional baby shrimp to go missing if they can catch it)
Avoid
- Anything big and pushy like cichlids (even the smaller 'semi-aggressive' ones) because the loaches get stressed and will hide nonstop
- Fin-nippers and hyper bullies like tiger barbs or serpae tetras (too much chaos, and they can turn the whole tank into a stress fest)
- Territorial bottom fish like many larger loaches or aggressive catfish (they will claim the same caves and shove these little guys around at feeding time)
Where they come from
Jingxi Yunnan loaches (Yunnanilus jinxiensis) come from Guangxi, China - cool, clean hill water. Think small streams and seep-fed runs with lots of stones, leaf litter, and gentle-but-steady flow. That origin pretty much explains why they can be fussy in warm, stagnant community tanks.
If you have kept other Yunnanilus, this one feels similar: it wants clean water, oxygen, and a mature tank. Brand-new setups almost always end in frustration.
Setting up their tank
Give them a footprint more than height. A 20 long works better than a tall 20, and bigger is always easier to keep stable. I keep mine over sand with lots of rounded pebbles and a few larger rocks to break line of sight. They spend a ton of time nosing around the bottom and weaving through gaps.
Flow and oxygen matter more than fancy decor. A sponge filter plus a small powerhead aimed along the back wall has worked well for me. You want that constant gentle current and surface agitation without blasting them into corners.
- Tank size: 20 long minimum, 30+ gallons is smoother for stability
- Substrate: sand or very fine gravel (they sift and graze)
- Hardscape: rounded stones, cobbles, small caves, leaf litter
- Plants: optional; tough stuff like Anubias, Java fern, moss on rocks works
- Filtration: oversized, with noticeable surface ripple and high oxygen
Use a prefilter sponge on any intake. These loaches love poking into places they do not belong, and a strong intake can beat up fins fast.
Water-wise, I aim for cool to mid-70s F at most (low 70s is where I see the best behavior), neutral-ish pH, and low nitrate. They do not like being cooked. If your fish room runs warm, a fan across the surface can make a surprising difference.
They are not forgiving of dirty substrate. If mulm builds up under rocks, you will see it in their health first - clamped fins, hiding, skinny bellies. Vacuum around the hardscape regularly.
What to feed them
These are micro-predator / grazer types. In my tanks they pick all day, but they still need real meals. I have the best luck feeding small foods that sink and spread out so everyone gets some.
- Staples: frozen cyclops, daphnia, baby brine shrimp, chopped bloodworms (sparingly)
- Prepared: small sinking micro pellets, crushed wafers, Repashy-style gel foods smeared on stones
- Live (great if you can): grindal worms, live daphnia, microworms, baby brine shrimp
- Extras: blanched spinach or zucchini occasionally, mostly for the biofilm it grows later
Feed tiny amounts more often instead of one big dump. They do better with 2-3 small feedings, and it cuts down on food rotting in crevices.
If a new group comes in skinny, I start with easy wins: frozen cyclops and live baby brine. Once they are confidently feeding, then I get them onto pellets. Some individuals learn fast, others take a couple weeks.
How they behave and who they get along with
They are generally peaceful, but they are not pushovers in the way some tiny loaches are. You will see little sparring and posturing, especially between males, but it is usually more bluff than damage if the tank has enough hides and broken sight lines.
They are also shy in bright, bare tanks. Give them shade, rocks, and a couple of leaf piles and you will see way more natural behavior. In a busy community tank with boisterous midwater fish, they often just vanish.
- Best kept: in a group (6+ is a good starting point)
- Good tankmates: small calm danios/rasboras that like cooler water, hillstream-type companions, small non-bullying minnows
- Avoid: warm-water fish, aggressive bottom dwellers, big boisterous feeders, anything that will outcompete them at mealtime
Do not mix them with larger loaches that hog caves (like big Botia types). The Jingxi will get stressed, eat poorly, and slowly waste away even if you never see obvious fighting.
Breeding tips
Breeding is possible, but it is not a guaranteed 'oops babies' fish. The pairs tend to scatter eggs in fine plants or mossy cracks, and the adults are not exactly careful about leaving them alone. I have seen spawning behavior after big cool-water changes and heavy feeding for a couple weeks.
- Conditioning: lots of small live/frozen foods for 2-3 weeks
- Trigger: cooler water change (a few degrees), plus increased flow
- Spawning sites: dense moss, fine-leaf plants, or a mesh/marble layer to drop eggs through
- Egg/fry plan: pull adults or move the spawning media; eggs are snack-sized
If you are serious about fry, set up a separate grow-out. The main tank is great for adults, but fry disappear fast in a rock-and-leaf maze.
Common problems to watch for
Most issues I have seen with this species come from the same three things: too warm, too dirty, or too much competition at feeding time. They do not always crash quickly - they just slowly look worse until you realize something is off.
- Skinny/pointy bellies: usually underfed or bullied off food; target feed with a baster and spread food out
- Clamped fins/hiding: often water quality or too much light/no cover
- Sudden losses after purchase: shipping stress plus immature tank; keep them in a seasoned setup and avoid big parameter swings
- Ich/velvet outbreaks: more common when they are stressed; treat gently and increase oxygen during meds
- Barbel wear/redness: rough substrate or dirty pockets under rocks; switch to sand and vacuum more
Be careful with strong medications and low oxygen. These loaches come from highly oxygenated water, and many treatments reduce dissolved oxygen. Add extra aeration any time you medicate.
If you want a simple success recipe: mature tank, cooler water, lots of oxygen, lots of little foods, and a group big enough that no single fish takes all the heat. Do that, and they stop being 'advanced' and start being really rewarding to watch.
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