The Paskai Rainbowfish, scientifically known as Melanotaenia paskai, belongs to the Melanotaeniidae family. These vibrant freshwater fish are native to West Papua, Indonesia. Paskai Rainbowfish are recognized for their striking coloration, with males displaying intense shades of blue, yellow, and red during breeding displays. Their genome reflects adaptations to the diverse aquatic environments they inhabit in their native region.

Creating an ideal environment for Paskai Rainbowfish involves:

- **Tank Size:** Provide a spacious tank of at least 30 gallons for a small group.
- **Water Parameters:** Maintain slightly acidic to neutral water conditions with a pH of 6.0-7.5.
- **Temperature:** Keep the water temperature between 75-82°F (24-28°C).
- **Filtration:** Use a quality filter to ensure good water quality.
- **Decor:** Include plants, driftwood, and hiding places to mimic their natural habitat.

Companion species for Paskai Rainbowfish include:

**Fish:**
1. **Celestial Pearl Danio (Danio margaritatus):** Similar size and peaceful temperament.
2. **Threadfin Rainbowfish (Iriatherina werneri):** Complementary colors, coexists well.
3. **Dwarf Gourami (Trichogaster lalius):** Peaceful, adds variety to the tank.
4. **Neon Tetra (Paracheirodon innesi):** Schooling fish, compatible in community setups.
5. **Corydoras Catfish (Corydoras spp.):** Bottom-dwelling, complements the mid and upper levels.

**Crustaceans:**
1. **Cherry Shrimp (Neocaridina davidi):** Hardy and colorful addition to the aquarium.
2. **Amano Shrimp (Caridina multidentata):** Effective algae eater, coexists peacefully.
3. **Bamboo Shrimp (Atyopsis moluccensis):** Filter feeder, non-aggressive.
4. **Mexican Dwarf Crayfish (Cambarellus patzcuarensis):** Small and suitable for community tanks.
5. **Viper Shrimp (Atya gabonensis):** Unique appearance, cohabits well with peaceful fish.

**Bugs:**
1. **Daphnia:** Small crustaceans, excellent live food for rainbowfish.
2. **Mosquito Larvae:** Natural and nutritious live food option.
3. **Fruit Flies (Drosophila):** Suitable for smaller fish as a live food source.
4. **Wingless Fruit Flies (Drosophila melanogaster):** Small and easily digestible for smaller fish.
5. **Brine Shrimp:** Enriched with nutrients, suitable for varied diet.

**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. **Vallisneria:** Tall grass-like plant, adds vertical structure.
4. **Cryptocoryne:** Hardy and provides hiding spots.
5. **Amazon Sword (Echinodorus spp.):** Adds greenery without being disruptive.

**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 rainbowfish.
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 Paskai Rainbowfish while enhancing the overall aesthetics of the aquarium.