Goldfish Care Starter Guide | Complete Guide to Startup Costs, Tank Size, and Required Equipment | ブリちょく
Goldfish| ✍️ BreederDirect Editorial
Goldfish Care Starter Guide | Complete Guide to Startup Costs, Tank Size, and Required Equipment
A beginner's guide to selecting the right tank size, filters, heaters, and startup costs needed to begin goldfish keeping.
Key Takeaways
A beginner's guide to selecting the right tank size, filters, heaters, and startup costs needed to begin goldfish keeping.
What Do You Need to Get Started with Goldfish Keeping?
Goldfish are considered relatively easy ornamental fish to keep, but starting with the "one goldfish in a fishbowl" image often results in early death due to water quality degradation and oxygen depletion. Having the right equipment and an appropriately sized tank is the first step toward long-term care.
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The BreederDirect editorial team specializes in care information for animals, covering veterinary care and breeding to deliver beginner-friendly guides.
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In this article, we'll explain the knowledge needed to get started with goldfish keeping and provide guidelines for startup costs in an easy-to-understand manner.
How to Choose Tank Size
Goldfish grow larger than you might expect. Wakin (common goldfish) and Shubunkin can reach over 20-30cm when fully grown, while Ryukin and Oranda can reach 15-20cm. Smaller tanks tend to have unstable water conditions and require more maintenance.
Recommended Tank Sizes
- 1-2 fish (small varieties): 45cm tank (approximately 30-35L) or larger
- 2-4 fish (medium varieties): 60cm tank (approximately 60-70L) or larger
- 4 or more fish (adults): 90cm tank (approximately 180L) or larger
Using "a minimum of 20-30 liters per fish" as a guideline will help you choose the right size. Smaller tanks experience water quality degradation more easily and require more frequent water changes, so starting with a 60cm tank is recommended for beginners.
Required Equipment List
Filter (Filtration System)
Goldfish produce more waste than other ornamental fish and easily foul the water. Choose a filter that has somewhat more capacity than the tank size requires.
Top Filter: Easy to maintain with high filtration capacity. Suitable for 60-90cm tanks
Hang-on Filter: Compact and small. Suitable for 45-60cm tanks
Canister Filter: Quiet operation with easily adjustable water flow. Ideal for medium to large tanks
Aeration (Oxygen Supply)
Goldfish consume a lot of oxygen. Especially in summer when water temperature rises and dissolved oxygen decreases, always install aeration using an air pump and air stone. This is particularly important when keeping multiple goldfish.
Thermometer and Heater
Goldfish can adapt to water temperatures between 5-30°C, but they are sensitive to sudden temperature fluctuations. With indoor keeping, water temperature can drop below 10°C in winter, so having a heater is reassuring. In particular, round-bodied varieties (Ryukin, Ranchu, and Oranda) prefer stable water temperatures around 20-25°C.
Substrate and Gravel
Goldfish have a habit of sifting through gravel to look for food. Substrate encourages natural behavior and helps establish beneficial bacteria. Larger-grain substrates like Ohiso sand or pea gravel are easier to clean and beginner-friendly. Bare-bottom tanks are easier to maintain but provide less area for beneficial bacteria to establish.
Lighting
While ornamental lighting isn't necessary for keeping goldfish, installing an LED light is recommended to enjoy their colors. Aim for about 8-10 hours of light per day. Excessive lighting can promote algae growth, so using a timer is convenient.
Initial Startup Costs
When Starting with a 60cm Tank Setup
Item
Estimated Cost
Tank (60cm)
¥2,000-5,000
Filter
¥3,000-8,000
Aeration Kit
¥1,500-3,000
Substrate (5kg)
¥500-2,000
Water Dechlorinator
¥500-1,000
Thermometer
¥300-800
Heater (optional)
¥2,000-4,000
Goldfish (3 fish)
¥1,000-5,000
Total
Approximately ¥11,000-29,000
When purchasing high-quality individuals from a breeder, goldfish prices can be significantly higher. Ranchu and large Ryukin can cost ¥5,000-30,000 or more per fish. Utilizing starter kits (tank + filter sets) according to your budget is also effective.
Tank Setup Process
Set up the tank and place substrate and equipment
Fill with dechlorinated tap water
Run the filter for 1-2 weeks of "fishless cycling" to establish beneficial bacteria
Once water conditions are stable, introduce a small number of goldfish
Acclimate the fish (gradually adjusting temperature and water conditions) over 30-60 minutes
In particular, establishing beneficial bacteria prevents acute poisoning from ammonia and nitrite. Rushing to add goldfish often results in death within a week. Using commercial bacterial supplements can shorten the cycling period.
Daily Care Tips
Water Change Frequency: 1-2 times per week, replacing about 1/3 of the water. Since goldfish easily foul the water, frequent water changes are the key to longevity.
Feeding: Once or twice per day, feed an amount they can consume in 2-3 minutes. Overfeeding causes water quality degradation.
Health Check: Daily observe your goldfish's swimming behavior, body surface, and fin condition. Early detection of abnormalities prevents disease from becoming severe.
Conclusion
To avoid failure when starting goldfish keeping, it's important to have a properly sized tank and basic equipment, and to adequately cycle the tank before introducing goldfish. Budget ¥10,000-30,000 for initial startup costs.
Purchasing directly from breeders allows you to obtain high-quality individuals with confirmed health status. You can also get advice on care conditions at the time of purchase, making it a recommended method for beginners.
