Description
The Tosakin Red goldfish is a rare and elegant breed, distinguished by its ornate finnage and unique swimming posture. Originating in Japan and traditionally bred in shallow waters, this variety is prized for its fan-shaped caudal fin, which spreads horizontally like an open flower. The Tosakin’s red coloration is deep and uniform, contributing to its ornamental value. Due to its delicate fins and specific care needs, this breed is best suited to controlled indoor environments where water conditions can be closely monitored. Not suitable for beginners.
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Features of a Tosakin Red
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Broad, flowing tail that spreads sideways rather than vertically
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Compact, egg-shaped body with no dorsal fin
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Deep, uniform red coloration across the body and fins
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Typically reaches 15–18 cm in length when fully mature
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Graceful, slow swimmers due to their ornate fins
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Sensitive to poor water quality and aggressive tank mates
The Best Aquarium Size for Tosakin Red
Tosakin Red goldfish require ample floor space and stable conditions. A minimum tank size of 80 litres is recommended for a single fish, with an additional 40 litres per extra fish. Low, wide tanks are preferable to accommodate their unique tail structure and limited swimming ability. Avoid strong currents, as they can damage the delicate fins.
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Tank Mate Compatibility for Tosakin Red
Tosakins do best with slow, peaceful species that won’t outcompete them for food or nip at their fins. Suitable companions include:
Diet for Tosakin Red
A high-quality, sinking pellet or gel-based diet is ideal to reduce the risk of buoyancy issues. Supplement with blanched vegetables such as spinach, lettuce, and shelled peas. Occasional protein sources like bloodworms or brine shrimp (frozen or live) can enhance colour and vitality. Feed 2–3 times daily in small portions.
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Aquarium Setup for Tosakin Red
Aquarium Filtration
Use a sponge or low-flow filter to maintain excellent water quality without disturbing their slow swimming pattern. Prioritise biological filtration.
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Aquarium Plants
Incorporate soft-leaved, rooted or floating species such as Anubias, Java Moss, or Salvinia. Avoid sharp or rigid plants.
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Aquarium Lighting
Soft to moderate lighting enhances fin visibility without stressing the fish. Avoid intense lighting or sudden light changes.
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Aquarium Heating
Maintain water temperatures between 20–23°C. Stability is essential; rapid temperature swings should be avoided.
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Aquarium Substrate
Use smooth sand or fine gravel to protect their undersides and prevent injury from bottom-feeding behaviour.
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Aquarium Decorations
Include smooth rocks, ceramic hides, and low ornaments. Allow for open swimming zones to support their limited mobility.
Stability is essential; rapid temperature swings should be avoided.
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