Slender-tail golden-line barbel

Where they come from

Sinocyclocheilus gracilicaudatus is a karst fish from southern China. Think limestone hills, cool springs, and cave-fed streams with super-clear, highly oxygenated water. Light is dim, flow is steady, and minerals from the rock keep the water on the hard-and-alkaline side. That background explains almost everything about how to keep them.

Setting up their tank

Give them room and flow. A 4-foot tank (at least 55-75 gallons) for a small group works. They pace and dart if spooked, so length matters more than height.

• Temperature: 16-22 C (61-72 F). They get cranky and sick above 23-24 C. A chiller or a cool room helps.
• pH: 7.2-8.2. KH and GH on the higher side (KH 4-12, GH 8-20 dGH). Crushed coral or limestone helps buffer.
• Flow and oxygen: strong filtration and surface agitation. Aim for 8-12x turnover per hour plus a powerhead.
• Substrate: fine sand or smooth small gravel. They root and can scrape themselves on sharp edges.
• Hardscape: caves, pipes, stacked rock with tight hidey-holes, and shaded zones. Keep it smooth.
• Lighting: low. Use floating plants or dim the lights. Bright light makes them bolt.
• Lid: tight-fitting with no gaps. They jump.
• Maintenance: big, regular water changes (30-50% weekly) with temperature-matched, well-aerated water.

What to feed them

They are omnivorous grazers that pick at biofilm and take small invertebrates. In the tank, go heavy on varied sinking foods and keep portions modest.

• Staples: quality sinking insectivore or omnivore pellets, spirulina wafers, and gel foods (Repashy Soilent Green/Super Green + Bottom Scratcher mix works well).
• Frozen: bloodworms, blackworms, daphnia, brine shrimp. Rinse before feeding.
• Veggies: blanched spinach, zucchini coins, or green peas (skins off).
• Schedule: 2 small feedings a day, with 1 light day per week. They bloat if overfed dry foods.

How they behave and who they get along with

They are calm but skittish. They cruise at mid-bottom, investigate slowly, and startle fast. A small group (4-6) spreads out the nerves and looks more natural.

• Tankmates: keep it quiet and cool-water. Hillstream loaches, Garra species (peaceful types), white clouds, or small rasboras that like current can work.
• Avoid: fin-nippers, fast boisterous fish, and warm-water species. Also skip big assertive barbs and cichlids.
• Feeding competition: they lose to speedy fish. If you add dither fish, keep the group small and feed in multiple spots.

Breeding tips

Captive spawns are rare, but you can nudge them by copying their rainy season. They are egg scatterers over rock and crevices, not parents.

• Condition adults with high-quality frozen and gel foods for a few weeks at the warmer end of their range (21-22 C).
• Trigger: one or two large water changes (40-60%) with slightly cooler water and a boost in flow and oxygen.
• Spawning site: rock piles, caves, and an egg-safe layer (marbles or mesh grate) to keep eggs from being eaten.
• Post-spawn: remove adults. Eggs need clean, well-aerated water; gentle airstone under a sponge filter.
• Raising fry: start with newly hatched brine shrimp and powdered fry food. Keep the water cool, clean, and moving.

Common problems to watch for

• Overheating: anything above 23-24 C makes them gasp and go off food. Add fans, crank surface agitation, or use a chiller in summer.
• Low oxygen: they come from high-O2 water. If they hang at the surface, add flow and reduce organics.
• Startle injuries: they slam glass or rocks when spooked. Keep lighting low, reduce reflections, and use smooth decor.
• Internal parasites: many arrive wild-caught. Quarantine 4-6 weeks and deworm (e.g., praziquantel) before adding to the display.
• Bloat and fatty liver: too much dry, high-fat food. Use gel foods and varied frozen; keep them a little lean.
• Skin fungus on scrapes: pristine water and added flow clear up most minor fuzz. If you must medicate, go half-dose and watch closely.
• Ammonia/nitrite spikes: they do poorly with any spike. Oversize the filter, pre-rinse frozen foods, and vacuum detritus weekly.