Speckled butterfly loach

Where they come from

Speckled butterfly loaches (Beaufortia polylepis) come from fast, rocky hillstreams in southern China and nearby areas. Think shallow water, lots of current, and algae growing on stones. If you copy that vibe at home, they act way more natural and you will see them out all day.

Setting up their tank

These guys are built like little suction cups for a reason. Give them a long footprint, hard surfaces to graze, and strong flow. You do not need a huge tank, but you do need a tank that is stable and well-oxygenated.

• Tank size: 20 gallons long is a nice starting point for a small group; bigger is easier to keep stable
• Substrate: sand or fine gravel, but the real estate that matters is rocks and smooth stones
• Hardscape: stacks of rounded river rocks, flat slate, and a couple of pieces of wood if you like (but keep lots of open rock surface)
• Flow and oxygen: powerhead or strong filter return aimed along the length of the tank; you want visible current
• Filtration: oversized sponge plus a hang-on-back or canister works great, as long as flow is not just surface-only
• Temperature: mid 70s F is a sweet spot for most setups; they can handle cooler, but avoid hot, stagnant water
• Lighting: moderate to strong helps grow the biofilm and algae they pick at all day

What to feed them

Most of the day they are grazing. They are not picky once settled, but they do best if you treat them like a fish that eats off surfaces, not a fish that chases food in open water.

• Staples: algae wafers, spirulina tabs, and sinking omnivore pellets (small ones)
• Fresh foods: blanched zucchini, cucumber, spinach, green beans (clip or weigh it down)
• Protein a couple times a week: frozen bloodworms, brine shrimp, daphnia, or repashy-style gel foods
• Natural grazing: mature rocks with green algae and brown biofilm

How they behave and who they get along with

They are peaceful, but not timid. You will see little shoving matches over favorite rocks, especially between males, but it is usually more posturing than damage. Keeping a small group spreads out the drama and makes them bolder.

• Good tankmates: other hillstream-friendly fish like white cloud mountain minnows, danios that like flow, small barbs, and many peaceful loaches
• Also works: shrimp and snails (adults are usually fine, though tiny shrimplets can go missing in any fish tank)
• Avoid: big aggressive fish, fin nippers, and slow fancy fish that hate current (they will be miserable in a hillstream setup)

Breeding tips

Breeding Beaufortia in home aquariums happens, but it is not as predictable as, say, livebearers. Most success stories look like this: a well-established, high-flow tank, lots of grazing, heavy feeding, and big cool water changes that mimic rain.

• Keep a group: 5-8 gives you better odds of both sexes and more natural behavior
• Condition them: lots of biofilm plus extra frozen foods for a few weeks
• Trigger: a slightly cooler water change and increased flow can help
• Egg safety: if they spawn, eggs can get eaten; lots of rock cracks and coarse gravel areas may give some a chance

Common problems to watch for

Most issues with speckled butterfly loaches are really "hillstream problems" - not enough oxygen, not enough mature grazing, or heat and waste building up.

• Slow weight loss: belly looks pinched or flat instead of nicely rounded - usually not enough biofilm or they are losing food to faster fish
• Gasping or hanging near the surface: low oxygen, poor circulation, or a dirty filter slowing flow
• Fin damage or scrapes: sharp rocks or rough decor - they press their bodies against surfaces a lot
• Ich and other parasites: often shows up after shipping stress; quarantine helps a ton
• Sudden deaths after a "med spree": they can be sensitive, especially to strong meds in low-oxygen tanks