General websites and information
- A World of Fish
- FishBase - database of fish species (search by common name, scientific name, family, country, ecosystem etc)
- The Krib: Aquaria and Tropical Fish
- The Tropical Tank - library of general articles (including information for beginners), index of fish species
- 500 Freshwater Aquarium Fish: A Visual Reference to the Most Popular Species. Edited by Greg Jennings. Surrey, Interpet Publishing, 2006.
- The Ultimate Encyclopedia of Aquarium Fish and Fish Care. Mary Bailey & Gina Sandford. London, Hermes House, 2004.
- The Krib's articles about fish keeping and breeding
- Tropical freshwater aquarium fish at Mongabay.com
- Beginner water chemistry
- The chemical properties of water
- The Krib's FAQ about the nitrogen cycle and "new tank syndrome"
- Water hardness table