Evezard's loach

Where they come from

Evezard's loach (Indoreonectes evezardi) comes from western India, where it lives in clear, fast-flowing hill streams. Think shallow water over rock, gravel, and leaf litter, lots of oxygen, and seasonal swings from monsoon flows to lower, cooler dry-season trickles.

That background explains basically everything about them in the aquarium: they want current, clean water, and they really do not enjoy a warm, stagnant community tank.

Setting up their tank

These are advanced mostly because they punish shortcuts. If your tank is already stable and you like river-tank setups, you're halfway there.

• Tank size: I'd start at 20 gallons long (or similar footprint) for a small group. More floor space beats more height.
• Substrate: smooth sand or fine gravel. They spend a lot of time on the bottom and will wedge into gaps.
• Hardscape: rounded river stones, pebbles, and a few larger rocks to break the flow and make little calm pockets.
• Plants: optional. Tough stuff attached to rocks works best (Anubias, Java fern, Bolbitis). In high flow, rooted plants can get annoying.
• Flow and oxygen: a strong filter, powerhead, and/or river manifold style setup. You want surface turbulence and no dead zones.
• Hiding spots: tight crevices, rock piles, and driftwood tangles. Give them choices so they do not all fight over one favorite cave.

Water-wise, I have had the best luck keeping them on the cool to mid range, with strong oxygenation. They can handle a range of pH and hardness if the water is clean and stable, but they do not love big swings. If you're running warm (upper 70s F and up) with low surface agitation, expect stress.

What to feed them

They are bottom-feeding micro-predators and pickers. In my tanks they act like little vacuum cleaners for frozen foods, but they still appreciate variety. If you only feed flakes at the surface, you'll think you have a "shy" fish. Really, it just never gets a fair share.

• Staples: sinking micro pellets, small sinking wafers broken into bits, and good frozen foods (bloodworms, brine shrimp, daphnia, cyclops).
• Best conditioning foods: live or frozen blackworms, live baby brine, and chopped earthworm bits for larger individuals.
• Occasional: repashy-style gel foods or finely chopped seafood (go easy - it can foul water fast).

Small meals work better than one big dump. With high flow and rockwork, food can vanish into cracks and rot. I would rather feed twice and watch them eat than overfeed once and hope for the best.

How they behave and who they get along with

They are active, bottom-oriented loaches that do a lot of darting, hovering, and "testing" every crevice. They are not usually bullies like some Botia can be, but they do establish little pecking orders, especially if you keep too few or you do not give enough hiding spots.

• Best group size: 5+ if your tank footprint allows it. In small numbers they can get jumpy and skittish.
• Good tankmates: other stream fish that like flow and cooler water (small barbs/danios from similar setups), hillstream loaches, and peaceful bottom fish that can handle current.
• Avoid: slow, long-finned fish, warm-water community staples, and anything that needs calm water (they will be stressed by the flow, and the loaches will outcompete them for food).
• Also avoid: aggressive bottom dwellers that claim caves (some cichlids, big Botia, and territorial catfish).

If you see chasing, it is usually about one prime shelter or a feeding spot. Add more rock piles, break lines of sight, and spread food out. That fixes most "mean loach" situations.

Breeding tips

Breeding Indoreonectes in home tanks is not something you stumble into often, but it is not a total fantasy either if you lean into their seasonal rhythm. In the wild they experience big changes with monsoon rains: cooler, very oxygen-rich water, lots of fresh food, and heavy flow.

• Start with a group and let them sort out pairs naturally. Sexing is not always obvious until they mature.
• Condition with heavy feedings of live/frozen foods for a few weeks, while keeping water clean with extra water changes.
• Then simulate a seasonal shift: slightly cooler water, bigger water changes with cooler water, and increased flow for a period.
• Give them spawning sites: gravelly areas, rock crevices, and clumps of fine-leaved plants or moss tucked between stones.

If you are serious about raising fry, plan on infusoria or other tiny first foods, then graduate to baby brine and microworms. Strong filtration is great, but cover intakes with sponge so you do not turn your filter into a fry trap.

Common problems to watch for

Most issues with Evezard's loach come down to three things: stale water, not enough oxygen, or competition at feeding time. They are not forgiving if your tank is running on autopilot.

• Rapid breathing or hanging in the highest-flow area: usually low oxygen or too-warm water. Add surface agitation, lower temp if appropriate, clean the filter, and check for clogged intakes.
• Sunken belly: they are not getting food (or have internal parasites). Target feed sinking foods, observe each fish eating, and quarantine new arrivals.
• Hiding all the time: often new-tank nerves, but also a sign of poor water quality, bullying, or not enough shelters.
• Damaged barbels or mouth: rough substrate, sharp rocks, or dirty bottom. Switch to smoother substrate and keep the bottom cleaner.
• Ich and stress diseases: they show up after temperature swings or shipping. Quarantine helps a lot, and keep treatments loach-safe (they can be sensitive).

One last thing: new imports can come in thin and stressed. Dim lighting, lots of rock cover, and frequent small feedings of frozen/live foods usually gets them settled. Once they are eating confidently in the open, you're in a good place.