The Oranda Goldfish, a popular fancy goldfish, is scientifically known as Carassius auratus. Goldfish, including the Oranda, belong to the Cyprinidae family and have a genome typical of their species. The evolution line of goldfish traces back to the Prussian carp, and through centuries of selective breeding, various ornamental varieties, like the Oranda, have been developed. Known for their distinct head growth (wen) and charming appearance, Oranda Goldfish are prized additions to freshwater aquariums.

Summary of Aquatic Life:
Oranda Goldfish are characterized by their prominent hood or wen on the head, which develops as they mature. Their vibrant colors, ranging from red and orange to calico, make them popular choices for aquarium enthusiasts. Orandas are social, preferring the company of other goldfish in well-maintained tanks. They are omnivores, requiring a balanced diet of high-quality pellets, live or frozen foods, and occasional vegetables.

Creating a Happy and Healthy Environment:
1. Tank Size: A spacious tank of at least 20 gallons for a single Oranda, with an additional 10 gallons for each additional fish.
2. Water Parameters: Maintain a temperature between 65-75°F (18-24°C) and a pH level between 6.0-8.0.
3. Filtration: Efficient filtration to ensure clean and well-oxygenated water.
4. Substrate and Decor: Use smooth gravel or sand substrate, avoiding sharp edges to protect delicate fins. Provide ornaments and plants for enrichment and hiding spots.
5. Feeding: Offer a varied diet including high-quality goldfish pellets, live or frozen foods like brine shrimp and bloodworms, and blanched vegetables.

Compatible Aquatic Life:

Fish:
1. Common Goldfish (Carassius auratus): Suitable tankmates for Orandas, sharing similar water requirements.
2. Ryukin Goldfish (Carassius auratus): Another fancy goldfish variety compatible with Orandas.
3. Black Moor Goldfish (Carassius auratus): Distinctive black coloration adds variety to the tank.
4. Fantail Goldfish (Carassius auratus): Elegant, double-tailed goldfish coexisting well with Orandas.
5. Telescope Goldfish (Carassius auratus): Known for their protruding eyes, adding diversity to the aquarium.

Crustaceans:
1. Amano Shrimp (Caridina multidentata): Non-aggressive shrimp suitable for larger setups.
2. Red Cherry Shrimp (Neocaridina davidi): Colorful and compatible with goldfish in a well-maintained tank.
3. Bamboo Shrimp (Atyopsis moluccensis): Larger filter-feeding shrimp suitable for larger tanks.
4. Ghost Shrimp (Palaemonetes spp.): Inexpensive and harmless tank cleaners.
5. Vampire Shrimp (Atya gabonensis): Peaceful filter-feeding shrimp.

Plants:
1. Anubias (Anubias spp.): Hardy, low-light plants for a natural aesthetic.
2. Java Fern (Microsorum pteropus): Attaches to driftwood, providing cover for the goldfish.
3. Amazon Sword (Echinodorus amazonicus): Larger plants suitable for spacious tanks.
4. Vallisneria (Vallisneria spp.): Tall, grass-like plants for the background.
5. Duckweed (Lemna minor): Floating cover for a more secure environment.

Bugs:
1. Bloodworms: High-protein live or frozen food.
2. Brine Shrimp: Excellent for conditioning and variety in diet.
3. Daphnia: Nutrient-rich live food for goldfish.
4. Tubifex Worms: Live or frozen food, providing a protein-rich option.
5. Mosquito Larvae: Natural and occasional live food.

Amphibians:
1. Dwarf African Clawed Frog (Hymenochirus spp.): Peaceful aquatic frogs.
2. African Dwarf Frog (Hymenochirus curtipes): Small, aquatic frogs compatible with goldfish.
3. Fire-Bellied Newt (Cynops spp.): Semi-aquatic newts suitable for a shared habitat.
4. Oriental Fire-Bellied Toad (Bombina orientalis): Colorful toads for a unique aquatic setup.
5. Mudskipper: Brackish water amphibian, providing a dynamic ecosystem.

These considerations contribute to a diverse and balanced aquatic community, ensuring the well-being of Oranda Goldfish and their tankmates.