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Freshwater fish care guide

Rosy Loach

Petruichthys sp. rosy

Small active loach that needs companions, oxygenated water, and fine hiding places.

Starter tank15+ gal
Temperature70–78°F
pH6.0–7.5
Group guide6+

Planning your aquarium

The library starting point is 15+ US gallons. Plan for the approximate 1.3-inch adult size and the species' normal activity, not just its current shop size.

The library suggests a group of at least 6. Count every individual when estimating stocking and swimming room.

Mixed-species aquariums may need substantially more space. Tank length, adult behavior, filtration, and hiding spaces all matter.

Tank setup and behavior

  • Provide bottom space, suitable substrate, and accessible hiding places.
  • Include planting or cover without removing all open swimming space.

Small active loach that needs companions, oxygenated water, and fine hiding places.

Food and feeding

Food options: Micro sinking pellets, Frozen daphnia, Baby brine shrimp.

Use appropriately sized, complete staple foods and rotate suitable foods for variety. Feed modest portions and remove uneaten food.

Compatibility

The current rule-based checker does not list a dedicated pairing warning for this species. That does not mean every pairing is safe; review temperament, adult size, diet, habitat and water requirements.