The Espei Rasbora, scientifically known as Trigonostigma espei, belongs to the Cyprinidae family. Originating from the slow-moving waters of Southeast Asia, particularly Thailand and Malaysia, these small and colorful fish are a popular choice for community aquariums. Espei Rasboras are characterized by their vibrant red and black coloration, distinctive lateral line, and the peaceful schooling behavior that makes them an attractive addition to a well-planted tank.

Creating an optimal environment for Espei Rasboras involves:

- **Tank Size:** Provide a tank of at least 10 gallons for a small group of Rasboras.
- **Water Parameters:** Maintain slightly acidic to neutral water with a pH of 6.0-7.0.
- **Temperature:** Keep the water temperature between 72-79°F (22-26°C).
- **Filtration:** Use a gentle filter to simulate their natural habitat.
- **Decor:** Include live plants, driftwood, and floating vegetation for shelter and security.

Companion species for Espei Rasboras include:

Fish:
1. **Harlequin Rasbora (Trigonostigma heteromorpha):** Close relatives, peaceful schooling behavior.
2. **Neon Tetra (Paracheirodon innesi):** Similar size and temperament, enhances the community.
3. **Dwarf Gourami (Trichogaster lalius):** Peaceful, adds variety to the tank.
4. **Honey Gourami (Trichogaster chuna):** Small and compatible with Rasboras.
5. **Pygmy Corydoras (Corydoras pygmaeus):** Bottom-dwelling, complements the mid and upper levels.

Crustaceans:
1. **Red Cherry Shrimp (Neocaridina davidi):** Hardy and colorful addition.
2. **Amano Shrimp (Caridina multidentata):** Effective algae eater, peaceful cohabitant.
3. **Ghost Shrimp (Palaemonetes spp.):** Inexpensive and compatible scavengers.
4. **Bamboo Shrimp (Atyopsis moluccensis):** Filter feeder, non-aggressive.
5. **Viper Shrimp (Atya gabonensis):** Unique appearance, cohabits well with peaceful fish.

Bugs:
1. **Daphnia:** Small crustaceans, excellent live food for Rasboras.
2. **Mosquito Larvae:** Natural and nutritious live food option.
3. **Wingless Fruit Flies (Drosophila melanogaster):** Suitable for smaller fish as a live food source.
4. **Brine Shrimp:** Enriched with nutrients, suitable for varied diet.
5. **Bloodworms:** High in protein, a favorite of many small fish.

Plants:
1. **Java Moss (Taxiphyllum barbieri):** Provides hiding spots and complements the environment.
2. **Anubias:** Hardy and can tolerate a variety of water conditions.
3. **Cryptocoryne:** Hardy and provides hiding spots.
4. **Rotala:** Adds vertical structure and enhances the aesthetic appeal.
5. **Duckweed (Lemna minor):** Floating plant, provides shade and cover.

Amphibians;
1. **African Dwarf Frog (Hymenochirus spp.):** Peaceful cohabitant in a community tank.
2. **Fire-Bellied Toad (Bombina spp.):** Compatible in terms of size and habitat.
3. **African Clawed Frog (Xenopus laevis):** Aquatic, doesn't disturb Rasboras.
4. **Dart Frogs (Dendrobatidae):** Terrestrial, won't interfere with the aquarium's balance.
5. **Mudskippers (Periophthalmus spp.):** Brackish water species, unique addition.

These carefully selected companions contribute to a balanced ecosystem, promoting the well-being of Espei Rasboras while enhancing the overall aesthetics of the aquarium.