Hillstream Loach tank mates
A river-adapted loach that requires fast, highly oxygenated flow unlike any other aquarium fish. Still or gentle water is lethal over time.
Lists below are built from this species record (safest, best with, risky, unsafe) — each link opens a pair-level check, not a guarantee.
Best tank mates (on file)
Merged from conservative safest and best with fields — de-duplicated by species.
The Hillstream Loach profile lists Otocinclus as both safe and a recommended pairing. Otocinclus schools in groups of 4 or more, so plan room for the whole group rather than one fish.
The Hillstream Loach profile lists Pearl Danio as both safe and a recommended pairing. Pearl Danio schools in groups of 6 or more, so plan room for the whole group rather than one fish. Pearl Danio swims in the top zone while Hillstream Loach stays in the bottom, so the two will not crowd the same water column.
The Hillstream Loach profile lists White Cloud Mountain Minnow as both safe and a recommended pairing. White Cloud Mountain Minnow schools in groups of 6 or more, so plan room for the whole group rather than one fish. White Cloud Mountain Minnow swims in the middle zone while Hillstream Loach stays in the bottom, so the two will not crowd the same water column.
The Hillstream Loach profile lists Zebra Danio as both safe and a recommended pairing. Zebra Danio schools in groups of 6 or more, so plan room for the whole group rather than one fish. Zebra Danio swims in the top zone while Hillstream Loach stays in the bottom, so the two will not crowd the same water column.
Risky or situational
From risky tank mates and broad avoid with (excluding “unsafe” below). May work with species-only setups, more water, or mature systems — read the pair page.
None on file beyond the safe list.
Fish to avoid with Hillstream Loach
From the unsafe list — predation, aggression, or space rules on this profile.
Discus conflicts with Hillstream Loach on temperament, predation, or footprint. The juvenile size in a shop tank is not the figure that matters here.
Betta conflicts with Hillstream Loach on temperament, predation, or footprint. The juvenile size in a shop tank is not the figure that matters here.
Oscar reaches 35cm and is flagged predatory. Hillstream Loach at 7cm is prey-sized for it. Oscar needs at least 300L, far above the 100L minimum for Hillstream Loach. The tank that houses one stresses the other. Oscar is rated aggressive and Hillstream Loach is rated peaceful. No community-style planning carries that gap.
Jack Dempsey reaches 25cm and is flagged predatory. Hillstream Loach at 7cm is prey-sized for it. Jack Dempsey is rated aggressive and Hillstream Loach is rated peaceful. No community-style planning carries that gap.
Tank size and groups
- Published minimum for Hillstream Loach: 100L — group minimum 3 .
- Compatibility changes when the tank is too short for turning, too little for a real school, or too warm for one species and not the other — that is why pair checks include tank context, not only temperament.
- Nearest litre hub to this minimum: 100L hub.
Easier alternatives to consider
Conservative beginner-peaceful picks from the library — not replacements for reading, but a shorter on-ramp than this species for a first tank.
Plan before you buy
Pair checks for every mix, then multi-species stocking in the builder.
Filtration & heating
A 100L minimum tank for Hillstream Loach needs a filter rated for at least 400L/hr turnover and a heater maintaining 20–25°C.
Similar fish (same category)
- Zebra Loach — min 120L
- Kuhli Loach — min 70L
- Dojo / weather loach — min 150L
- Yoyo Loach — min 200L
- Clown Loach — min 400L