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How Many Fish Can Your Tank Hold?

Calculate the maximum fish capacity for your aquarium. By tank size, fish type, and filtration — avoid overstocking.

📅 Updated April 2026 Formula verified 📖 4 min read 🆓 Free · No sign-up

Rule

1 cm adult fish per 2 litres। 100L: ~50 cm total। Guppies, Mollies, Tetras: popular Indian beginner fish। Goldfish need 60L+ EACH — not bowls! Start with minimum 60L tank।

Indian Market

Aquarium shops: every major city। Online: Amazon, IndiaMart। Sobo, Sunsun: affordable equipment brands।

⚡ CalcWolf Insight

New Tank Syndrome kills more fish than any disease. A brand-new aquarium has no beneficial bacteria to process ammonia. Cycle your tank for 4-6 weeks before adding fish — or use a "fish-in" cycle with hardy species (danios) and daily water testing. Ammonia and nitrite must be at 0 ppm before adding more fish.

Frequently asked questions
60L में कितनी?
~30 cm adult fish। 8 Guppies + 4 Corydoras।
Goldfish bowl?
NO — Goldfish need 60L+ per fish। Bowls are cruel and unhealthy।
✓ Math logic verified against primary sources → See our verification process
Kevin Glover
Founder, CalcWolf · GLVTS · Blickr
All formulas sourced from primary references — IRS publications, peer-reviewed research, and official standards. Results are tested against independent reference calculators before publishing. Rates and brackets updated when official sources change. Editorial policy →
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