Hillstream Loach: tank size, group & compatibility data

Stocking notes

Rheophilic bottom fish that need high oxygen, current and mature grazing surfaces.

For planning, StockingLab models Hillstream Loach at its approximate adult size rather than the juvenile size commonly seen in shops. That matters because space use and waste production can change dramatically as fish mature.

What the calculator checks

• Whether the tank's usable volume is below the 75 L / 19.8 US gal reference minimum.
• Whether the selected group is below the planner's typical 3 fish social starting point.
• Whether target temperature and pH sit inside the planning range.
• Whether prospective tankmates create predation, fin-nipping, territorial or water-overlap conflicts.
• Whether too many fish accumulate in the same bottom swim zone.

Before buying

Use this profile as a shortlist tool, not as a substitute for a dedicated care source. Confirm adult size, diet, sex ratio, habitat structure and locally relevant water conditions before purchase.

How to interpret this Hillstream Loach profile

At roughly 6 cm / 2.4 in adult length, Hillstream Loach should be planned at mature size rather than the smaller size commonly offered for sale. The reference tank is 75+ L / 19.8+ US gal, with a planning water window of 20–25°C and pH 6.5–8. A midpoint around 22.5°C and pH 7.2 is useful only as a comparison aid; the aim is stable water that overlaps the needs of the whole community.

StockingLab starts with 3+ individuals for this profile, so the reference tank has to accommodate the group's adult footprint rather than one specimen. The modeled waste factor is 0.80×, so biological load is only one part of the decision; adult space, group size and swim-zone crowding still need to be checked. Activity is modeled at 0.85×, so the planner balances ordinary movement demand with adult size and bottom-zone occupancy.

Common planning mistakes to avoid

• Check that the planned temperature sits inside the shared 20–25°C range for every species in the community.
• Use the 75 L / 19.8 US gal reference as a starting point, then let actual tank dimensions, filtration and the full stock list refine the decision.

Bottom line: the profile is designed to screen a proposed aquarium for obvious pressure points. A result that passes StockingLab still needs to be checked against current, species-specific husbandry information for Sewellia lineolata, especially diet, breeding behavior, sex ratio and habitat structure.