Ranchu – Milk Cow (Black and White)

The Ranchu Milk Cow is a highly prized variety of fancy goldfish distinguished by its rounded contours, absence of a dorsal fin, and striking black-and-white coloration reminiscent of a Holstein cow. Originating from Japan, this selectively bred fish is a variant of the traditional Ranchu goldfish and is cherished for its ornamental value, peaceful demeanor, and unique aesthetic appeal in aquascaped tanks.

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Features of a Ranchu Milk Cow

• Distinctive black-and-white milk cow pattern with no two fish exactly alike

• Rounded, egg-shaped body with a pronounced arch in the back

• Absence of dorsal fin, leading to a smooth, curved silhouette

• Well-developed head growth (wen) that becomes more prominent with age

• Typically grows to 1215 cm in length in optimal conditions

• Slow swimmer with a gentle, deliberate movement

The Best Aquarium Size for Ranchu Milk Cow

Due to their size and sensitive swimming capabilities, a minimum aquarium volume of 75 litres is recommended for one Ranchu Milk Cow. For each additional fish, increase the volume by at least 35 litres. Long, shallow tanks are preferable over tall tanks to allow easier access to the surface and reduce swimming strain.

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Tank Mate Compatibility for Ranchu Milk Cow

Ranchu Milk Cows are peaceful and thrive best with similarly tempered, slow-moving species. Suitable companions include:

1. Celestial Eye Goldfish

2. Bubble Eye Goldfish

3. Lionhead Goldfish

4. Pearlscale Goldfish

5. White Cloud Mountain Minnow

6. Dojo Loach

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Diet for Ranchu Milk Cow

A balanced diet is essential to prevent buoyancy disorders and maintain coloration. Feed a varied mix of high-quality sinking pellets, blanched vegetables (such as zucchini or spinach), frozen bloodworms, and daphnia. Avoid floating food to reduce the risk of air ingestion.

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Aquarium Setup for Ranchu Milk Cow

Aquarium Filtration

Use a low-flow filter system such as a sponge filter or a canister filter with flow control to maintain excellent water quality without producing strong currents.

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Aquarium Plants

Opt for hardy, low-light plants like Anubias, Java Fern, and Hornwort. These are non-toxic and wont be uprooted easily by digging behaviour.

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Aquarium Lighting

Moderate lighting is sufficient. Ensure a consistent photoperiod of 810 hours per day using LED lighting to promote plant health and reduce algae growth.

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Aquarium Heating

Maintain water temperature between 2024C. Use an adjustable aquarium heater with a thermostat to ensure stability.

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Aquarium Substrate

Fine sand or smooth, rounded gravel is recommended to prevent injury to the fishs delicate underbelly.

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Aquarium Decorations

Choose rounded, smooth decorations without sharp edges. Avoid plastic dcor that may damage the fish’s wen or scales. Include open areas for swimming and shaded zones for resting.

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