The Rosy Tetra (Hyphessobrycon rosaceus) is a popular and colorful freshwater aquarium fish. Here's some information about its care and lifestyle:

1. Appearance:

   • Rosy Tetras are small, typically reaching about 1 to 1.5 inches (2.5 to 3.8 cm) in length.
   • They have a distinctive pink to reddish-pink coloration with a silvery iridescence, and their fins may have a slightly darker shade.

2. Habitat:

   • Native to South America, Rosy Tetras are found in slow-moving rivers and tributaries in regions such as Brazil and Paraguay.

3. Tank Setup:

   • Provide a well-planted aquarium with open swimming spaces.
   • They prefer subdued lighting, and floating plants or decorations can help create shaded areas in the tank.
   • Maintain stable water conditions with a temperature between 72°F to 79°F (22°C to 26°C), a pH range of 6.0 to 7.5, and soft to slightly hard water.

4. Diet:

   • Rosy Tetras are omnivores. Offer a balanced diet that includes high-quality flake food, small live or frozen foods like brine shrimp or bloodworms, and occasionally vegetable matter.

5. Behavior:

   • Rosy Tetras are generally peaceful and suitable for community aquariums.
   • They are schooling fish, and it's recommended to keep them in groups of at least six individuals to reduce stress and encourage natural behaviors.

6. Tank Mates:

   • Rosy Tetras can be kept with other peaceful community fish of similar size.
   • Avoid aggressive or large tank mates that may intimidate or harass them.

7. Breeding:

   • Rosy Tetras are egg scatterers, and breeding them in captivity is possible.
   • Provide a separate breeding tank with fine-leaved plants for the eggs to fall into, as adult Rosy Tetras may eat their own eggs.

8. Water Quality:

   • Regular water changes are essential to maintain good water quality.
   • Use a good filtration system to keep the water clean, and monitor water parameters regularly.