Goldfish Mystery Box

Be surprised with this mystery box containing Goldfish.

The size of thefishyou receive in this box willgenerally range from 5cm up to 9cm.

Ensure that the space in the aquarium is plentiful.

Goldfish (Carassius auratus) are among the most popular freshwater aquarium fish, renowned for their striking appearance, calm temperament, and hardy nature. Bred over centuries into a wide range of forms and colours, they are ideal for both beginner and experienced aquarists when given the appropriate care. While commonly associated with small bowls, goldfish require spacious, well-maintained aquariums to thrive and reach their full potential.

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Features of a Goldfish

• Long lifespan: 1020 years with proper care

• Grows up to 30 cm, depending on the variety

• Variants include common, comet, fantail, and oranda

• Omnivorous and highly active

• Tolerant of cool water but sensitive to poor water quality

• Constant foragers that produce significant waste

The Best Aquarium Size for Goldfish

Goldfish need ample space to support their growth and maintain stable water conditions. A single goldfish requires a minimum of 75 litres, with an additional 4050 litres per additional fish. Long, horizontal tanks are preferred over tall or narrow ones, as goldfish are active swimmers and benefit from greater surface area and oxygen exchange.

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Tank Mate Compatibility for Goldfish

Goldfish are peaceful and do best with other species that thrive in similar cool water conditions. Avoid tropical species and aggressive tank mates. Suitable companions include:

• White Cloud Mountain Minnows

• Dojo Loaches

• Rosy Barbs

• Zebra Danios

Coburg Aquarium specialises in different species of live fish.

Diet for Goldfish

Goldfish require a varied, balanced diet. High-quality sinking pellets or flakes designed specifically for goldfish form the dietary staple. Supplement with blanched vegetables such as peas, spinach, and zucchini, along with occasional live or frozen foods like bloodworms and daphnia. Feed small amounts 12 times per day, ensuring all food is consumed within two minutes to prevent water fouling.

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Aquarium Setup for Goldfish

Aquarium Filtration

A powerful, reliable filter is essential due to goldfish’s high waste output. Use external canister or internal sponge filters with mechanical and biological media.

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Aquarium Plants

Goldfish often uproot or nibble on plants. Hardy options include Java fern, Anubias, and hornwort. Choose plants that can be anchored or floated.

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Aquarium Lighting

Moderate lighting (68 hours daily) supports plant health and maintains the fish’s natural rhythm.

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Aquarium Heating

Heating is generally unnecessary. Maintain a stable water temperature between 1824C.

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Aquarium Substrate

Use smooth gravel or sand to prevent injury and facilitate foraging behaviour.

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Aquarium Decorations

Avoid sharp or rough decor that may damage delicate fins. Use smooth stones, driftwood, and goldfish-safe ornaments.

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