Torrent catfish

Where they come from

Torrent catfish in the genus Glyptothorax are built for speed. This species, G. chimtuipuiensis, is from the Chhimtuipui basin in Mizoram, northeast India. Picture cool, clear, boulder-strewn streams with heavy current and loads of oxygen. They hug rocks with a little adhesive pad on the chest and pick at whatever the current brings.

Setting up their tank

Think river, not pond. Long tank, fast water, and spotless, oxygen-rich conditions.

• Tank size: 90 cm/36 in length minimum. I like 40 gallons or more for a small group so you get good flow without turning the tank into a blender.
• Substrate and hardscape: rounded river stones, cobbles, and patches of sand. Stack stones so there are firm ledges and crevices. They press their bellies on rock and hate wobbly piles.
• Flow and filtration: aim for 10-20x turnover per hour. A canister with a strong spray bar plus one or two powerheads works. Point outlets along the length to create a single directional run.
• Aeration: big rippling surface 24/7. Add air stones under the powerhead outflow so the current chops the bubbles into fine microbubbles.
• Water: cool and very clean. 18-24 C (64-75 F), try to sit around 20-22 C. pH 6.5-7.5. Soft to moderate hardness.
• Lighting: moderate. Enough for biofilm to grow on rocks, but keep heat under control.
• Lid: tight-fitting. They climb glass and ride the flow.

What to feed them

They are not algae eaters. They graze on insect larvae and small critters caught in the flow, and they will pick at biofilm between meals.

• Frozen or live: bloodworms, blackworms, daphnia, cyclops, brine shrimp, chopped earthworms.
• Prepared: small sinking carnivore pellets, high-protein wafers, and gel foods like Repashy Bottom Scratcher. Press gel into the gaps of rocks so it stays put in current.
• Natural grazing: let algae and microfilm grow on stones. Rotate a few extra stones in a bucket of sunlit water to keep a steady supply.

How they behave and who they get along with

Mostly bottom-huggers that defend a favorite rock, then shuffle a few inches over and resume browsing. Short chases happen, but they are more pushy than violent. Keeping them in a group spreads the attitude and you see more natural behavior.

• Group size: 4-6 is a good start if the tank footprint and flow allow it.
• Good tankmates: fast, current-loving fish from similar water. Devario, Danio, smaller Garra, hillstream loaches (Sewellia, Gastromyzon), cold-tolerant barbs. Avoid fish that hog the bottom nonstop.
• Avoid: big cichlids, slow long-finned fish that cannot handle current, overly boisterous loaches that body-slam, and delicate shrimp that could become snacks.

Breeding tips

I have not seen confirmed home-breeding reports for this exact species, and mine never spawned. Wild cycles are strong where they live, so it likely ties to monsoon cues: temp drops, surge in flow, and high food density.

• Set a mature river tank with rounded stones and coarse gravel between them.
• Keep a small group and condition them with meaty foods for several weeks.
• Try a pre-monsoon shift: reduce temp 2-3 C, then gradually increase flow and daily water changes with slightly cooler water.
• If courtship happens, expect scattering among stones. A mesh over the gravel or marbles between rocks may save eggs from hungry mouths.

Common problems to watch for

• Low oxygen stress: hanging near the surface or powerhead, rapid gill movement. Fix by boosting surface agitation and flow immediately.
• Heat spikes: above 25-26 C for long stretches can wipe them out even if ammonia and nitrite are zero.
• Skin scrapes and fungus: rough rock or sudden scuffles can cause abrasions that fungus over in warm, slow water.
• Internal worms or flukes from wild-caught fish: weight loss despite eating, flashing, or excess mucus. Quarantine and treat once settled.
• Starvation in spotless tanks: if all rock faces are squeaky clean and food gets swept into the filter, they slowly waste away. Feed heavier, more often, and let some biofilm return.
• Filter intake injuries: guard intakes with sponges. They will plaster themselves against anything in the current.