Nanpanjiang stone loach

Where they come from

Nanpanjiang stone loaches are small, bottom-hugging nemacheilids from the Nanpan River system in Yunnan and Guizhou, China. Think clear, cool to mild streams with sand and fine gravel, leaf litter tucked in the edges, and plenty of oxygen. They spend most of their time slipping between stones and nosing through the top layer of sand for micro life.

Setting up their tank

Floor space matters more than height. A 24-30 inch tank footprint works for a group. They are sensitive to grime, heat, and low oxygen, so build the tank like a gentle river run with lots of cover.

• Substrate - fine sand as the main bed, with scattered smooth pebbles. They burrow their snouts and rest half-buried. Avoid sharp gravel.
• Hardscape - rounded stones piled into nooks, a couple of small wood pieces, and leaf litter. These fish calm down when they can vanish under a leaf or between two rocks.
• Plants - low light plants tied to wood or rock (Anubias, Microsorum, Bolbitis). Fast stems in the back help with nutrients but do not block the flow path.
• Filtration and flow - canister or HOB with a sponge prefilter, plus a small powerhead. Aim for brisk, broken flow along one side and a quieter return lane on the other. Add an airstone during warm months.
• Lighting - on the dimmer side. Dappled light from floating plants helps.
• Lid - tight fitting. They can and will find gaps.

• Temperature - 18-22 C (64-72 F) is the sweet spot. Short swings down to 16 C are fine. Try not to exceed 24-25 C.
• pH - 6.8-7.5
• Hardness - 3-10 dGH, 80-180 TDS
• Turnover - 8-12x per hour, with lots of surface movement

Maintenance makes or breaks this species. Do weekly 30-50% water changes, vacuum the top of the sand lightly, and rinse prefilters often. Keep nitrates under 20 ppm and organics low.

What to feed them

They are micro-predators that pick at tiny inverts and biofilm. New arrivals often ignore pellets. Offer small live or frozen foods and give them time.

• Live or frozen - baby brine shrimp, daphnia, cyclops, mosquito larvae, chopped blackworms, bloodworms in moderation.
• Prepared - high-quality micro pellets, crushed wafers, and gel foods once they settle. Repashy-style gels work well because you can press them into crevices so the loaches get first dibs.
• Feeding style - small portions 2-3 times a day. Use a pipette or turkey baster to target the bottom and under leaf edges. Scatter the food so the timid ones get a chance.

How they behave and who they get along with

Shy at first, quick and twitchy when startled, and surprisingly curious once they settle. They do best in a group of 8-12. Lone fish stay jumpy and hidey.

• Intra-species - mild sparring between males, mostly harmless side-by-side posturing. Provide many line-of-sight breaks so one fish does not get cornered.
• Good tankmates - small, peaceful, cooler-water fish that will not hog all the food: white clouds, small Tanichthys, tiny rasboras, ricefish. Hillstream loaches can work if the tank is big and food is abundant.
• Avoid - boisterous barbs, cichlids, big gouramis, or any bottom bully. Fast, greedy midwater fish will starve them out. Shrimp colonies may lose shrimplets.

Breeding tips

This genus likely scatter-spawns in fine gravel and leaf litter with no parental care. It is doable but takes planning and patience.

• Conditioning - cool period around 16-18 C for 4-6 weeks with heavy feeding of live foods, then raise to 20-22 C and do a couple of large water changes to mimic rain.
• Spawning setup - shallow tray filled with marbles or 3-5 mm gravel under a mesh, topped with a sprinkling of sand and leaf litter. Current running across it. Adults will dive in and scatter eggs.
• Post-spawn - pull the adults or move the tray to a separate tank. Eggs hatch in 2-4 days at 20-22 C. Fry are tiny and light-shy.
• First foods - infusoria and paramecium for the first few days, then microworms and vinegar eels. Add newly hatched brine shrimp once they can take it.
• Cover for fry - biofilm-rich leaves and mosses are your best friend. Keep flow gentle but well aerated.

Common problems to watch for

• Low oxygen in warm weather - first signs are frantic surface dashes and rapid gill beats. Increase surface agitation immediately.
• Barbel erosion and mouth sores - usually from dirty, coarse substrate. Switch to fine sand and step up your cleaning.
• Getting outcompeted - they are slow, methodical eaters. Target feed and reduce midwater competition.
• Wormy or pinched look despite eating - common with wild fish. Quarantine and treat for internal parasites before adding to your display.
• Jumping - spooks at sudden movement or lights. Use a tight lid and bring room lights up before tank lights.
• Scrapes from intakes - cover filter and powerhead intakes with sponge.