3 Little Fish

Aquarium Library

Practical guides, calculators and helpful resources to help you build and maintain a healthy aquarium.

Calculators & Tools

Useful tools for planning and maintaining your aquarium.

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Aquarium Volume Calculate your aquarium's actual water volume.
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Stocking Calculator Plan your aquarium stocking levels.
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Water Change Calculator Work out how much water to change.
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Dosing Calculator Calculate aquarium treatment and dosing amounts.
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Temperature Converter Quickly convert Celsius and Fahrenheit.
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Aquarium Guides

Learn the essentials of keeping a healthy aquarium.

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Fish
Species care, compatibility, feeding and stocking advice.
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Shrimp & Snails
Care guides for freshwater shrimp and snails.
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Aquarium Plants
Plant care, placement, lighting and beginner-friendly plants.
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Water & Parameters
Learn about pH, GH, KH, ammonia, nitrite and nitrate.
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Maintenance
Water changes, cleaning, filtration and aquarium routines.
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Troubleshooting
Find solutions to common aquarium problems.
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🌱 New to aquariums?

Start here. Our beginner's guide walks you through everything you need to know to set up and maintain a healthy aquarium.

Start the Beginner's Guide →

Latest from the Library

New guides, tips and aquarium knowledge.

💧 Water & Parameters

The Nitrogen Cycle

3 Little Fish • Aquarium Guide The Aquarium Nitrogen Cycle Why ammonia appears, how biological filtration makes ...

🦐 Shrimp & Snails

Cherry Shrimp (Neocaridina Davidi) Care Guide

Neocaridina davidi — an in-depth guide to setting up the right environment, maintaining stable water, feeding, moulti...