How Much Does Saltwater Fish Keeping Cost? Monthly Running Costs Explained

Many people dream of keeping colorful marine fish like clownfish and blue tangs, but the perceived high cost often holds them back. Here is a detailed breakdown of actual expenses, from initial setup to ongoing running costs.

Initial Setup Cost Estimates

• Aquarium (30-60cm): 5,000-20,000 yen (marine-specific or glass tanks are standard)
• External filter / sump filter: 8,000-25,000 yen (filtration capacity can be a matter of life or death for marine fish)
• Protein skimmer: 10,000-25,000 yen (effective for organic waste removal in marine fish keeping)
• Heater and chiller: 5,000-20,000 yen (stable water temperature is essential)
• Live rock: 5,000-15,000 yen (assists biological filtration and provides hiding spots)
• Synthetic sea salt and hydrometer: 3,000-5,000 yen
• Lighting: 3,000-15,000 yen (fish-only tanks don't need coral-grade performance)

The total initial setup cost is estimated at 50,000-120,000 yen. Costs increase with larger tanks, but larger water volumes stabilize water quality, making long-term management easier.

Monthly Running Costs

• Electricity: 2,000-6,000 yen (varies by tank size and chiller usage)
• Synthetic sea salt: 1,500-3,000 yen (weekly water changes are standard)
• Fish food: 500-1,500 yen (varies with frozen, dried, and prepared food combinations)
• Filter consumables (activated carbon, filter wool, etc.): 500-1,000 yen

The typical monthly maintenance cost totals 5,000-15,000 yen.

Tips for Saving Money

• Start with a small 30cm tank: Lower initial costs and electricity, with less damage from mistakes
• Stock frozen food in bulk: Reduce per-serving costs through bulk purchases
• Use tank fans instead of a chiller: Effective for summer cost reduction (though evaporation management is needed)
• Use quality second-hand equipment: Filters and tanks in good condition can significantly cut costs

Benefits of Buying on Buri-Choku

On Buri-Choku, you can purchase marine fish directly from breeders.

• Healthy domestically bred specimens: Less shipping stress and higher survival rates after introduction
• Available at fair prices: No retail markups, keeping costs down
• Get expert advice: Ask breeders directly about care conditions and tankmate compatibility