Nomi stone loach

Where they come from

Schistura nomi is one of those hillstream-type stone loaches that comes from clear, fast-moving streams in Southeast Asia. Think shallow runs, lots of rock and gravel, strong current, and water that stays cool-ish and packed with oxygen.

That background explains basically everything about keeping them: they do best in a tank that feels like a stream, not a calm community aquarium.

Setting up their tank

If you take one shortcut with Nomi stone loaches, make it anything except flow and oxygen. They are the kind of fish that look fine for a bit in a quiet tank, then slowly go downhill. A stream-style setup fixes most headaches before they start.

• Tank size: I would start at 20 gallons long for a small group. Bigger is easier because you can run more flow without blasting everyone.
• Flow: strong. Use a powerhead or a canister return aimed down the length of the tank. You want obvious current and surface agitation.
• Filtration: over-filter. Canister filters shine here, but a big HOB plus powerhead can work if you keep up with maintenance.
• Oxygen: keep the surface moving. An airstone is not mandatory if your flow is right, but it never hurts.
• Substrate: smooth gravel, small rounded stones, and sand patches. Skip sharp gravel - these fish spend their lives on the bottom.
• Hardscape: lots of cobbles, flat stones, and crevices. Build sight breaks so they can get out of each other's face.
• Plants: optional. Tough stuff like Anubias, Java fern, Bolbitis, or moss tied to rocks works. Delicate stems get shredded by current and maintenance.
• Temperature: mid 70s F is a nice target. Warmer water holds less oxygen, so if you push temps up, you need to push aeration and flow up too.

Water chemistry is less of a big deal than water quality. Neutral-ish pH is fine. What matters is low waste, steady parameters, and water that smells like nothing. I do smaller, frequent water changes on stream fish rather than big, sporadic ones.

What to feed them

These are not algae grazers like some people assume from the loach label. They are mostly micro-predators. In my tanks they spend a lot of time picking at surfaces, but what they are really after is tiny meaty bits: worms, insect larvae, crustaceans.

• Staples: sinking micro pellets, small sinking carnivore pellets, and good quality wafers that are more protein than plant.
• Frozen: bloodworms, blackworms, daphnia, cyclops, brine shrimp, chopped mysis (if pieces are small enough).
• Live (great for conditioning): grindal worms, live blackworms, baby brine, small live daphnia.
• Extras: Repashy style gel foods work well because you can smear a little on a rock and they will peck at it in the current.

Watch their bellies. A well-fed stone loach looks a bit filled out, not pinched behind the head. If they are always skinny even though you feed, think parasites, competition at feeding time, or food blowing away in the current before they can grab it.

How they behave and who they get along with

Schistura are confident little bottom fish with opinions. They are not nonstop bullies, but they do claim favorite spots and they will spar. Most of the drama is quick chasing and posturing around rocks.

• Best kept as: a small group (3-6) in a tank with enough floor space and lots of hiding spots.
• Activity: daytime-active once settled, especially if you feed at regular times.
• Territory: they like to sit in the flow near a rock edge, then dart out to forage.

Tankmates should be fish that like current and cooler, oxygen-rich water. Think danios, white cloud mountain minnows, and other stream-friendly cyprinids. For the bottom, I avoid mixing them with slow, gentle bottom dwellers that want calm water (corys, many dwarf cichlids) because someone ends up stressed.

Breeding tips

Breeding Schistura nomi in a home aquarium is possible but not something I would call predictable. Most people who get anywhere with stone loaches are basically recreating a stream season: heavy feeding, big clean water changes, and a temperature shift that mimics rain.

• Group size matters: more fish gives you better odds of having both sexes and triggering natural behavior.
• Conditioning: lots of live and frozen foods for a few weeks, with very clean water.
• Spawning cues: slightly cooler water change and an uptick in flow can get them excited.
• Where eggs might go: deep in rock piles, under flat stones, sometimes into fine gravel gaps.

Common problems to watch for

Most issues with this species come back to three things: not enough oxygen/flow, not enough food getting to the shy fish, or general bottom-of-the-tank gunk building up.

• Slow decline in a calm tank: they get less active, breathe faster, and lose weight. Fix with more flow, more surface agitation, and cleaner water.
• Skinny fish despite feeding: food is drifting away, tankmates outcompete them, or internal parasites. Try target feeding and consider deworming if weight does not improve.
• Fighting that escalates: too few hiding places or too small a footprint. Add more rocks, break sight lines, or reduce the group.
• Sensitivity to meds: like many loaches, they can react badly to strong doses. Go slow, research the medication, and increase aeration during treatment.
• Ich after purchase: stress plus cooler-water fish shipped warm can trigger it. Quarantine helps a lot, and stable temps with high oxygen makes recovery easier.