The Spotted Hillstream Loach (Sewellia sp.) is a small, unique, and attractive freshwater fish that belongs to the family Balitoridae. Here is some information about their care and lifestyle:

1. Appearance:

   • Spotted Hillstream Loaches have a distinctive appearance with a flattened body and a sucker-like mouth.
   • They often have a mottled or spotted pattern on their body, which helps them blend into their natural rocky stream habitats.

2. Habitat:

   • Hillstream loaches are native to fast-flowing, well-oxygenated streams and rivers in Southeast Asia.
   • They are adapted to habitats with rocky substrates and strong water currents.

3. Tank Setup:

   • Provide an aquarium setup that mimics their natural habitat, including smooth rocks, pebbles, and a strong water flow.
   • A well-oxygenated aquarium with the use of a powerhead or water pump is beneficial.
   • Maintain water parameters with a temperature range of 72°F to 78°F (22°C to 26°C), a pH of 6.5 to 7.5, and soft to moderately hard water.

4. Diet:

   • Spotted Hillstream Loaches are primarily herbivores, and their diet should include algae-based foods.
   • Offer sinking pellets, wafers, and occasional live or frozen foods like bloodworms.

5. Behavior:

   • These loaches are generally peaceful, but they can be territorial.
   • They are more active in the presence of strong water flow, and they often cling to surfaces using their sucker-like mouths.

6. Tank Mates:

   • Spotted Hillstream Loaches can be kept with other peaceful fish that share similar water parameters.
   • Avoid keeping them with aggressive or fin-nipping species.

7. Breeding:

   • Breeding hillstream loaches in captivity can be challenging, and specific breeding behaviors may not be well-documented.
   • Replicating their natural conditions, such as strong water flow, may trigger breeding behavior.

8. Maintenance:

   • Regular water changes are important to maintain good water quality.
   • Keep an eye on water parameters, especially if using a powerhead or pump to create water flow.