I keep a super low maintenance 55 gallon fresh water tank. No water changes, no C02 injection, no fertilizer, no medicines. I don't even test the water anymore! My fish and plants are super healthy! The book to read about how to do it is by Diana Walstad. She runs a forum at aquabotanic.com

About Saltwater Aquariums
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Aqua Botanic-Aquarium Plants and Aquascaping
aquabid.com
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aquatic plants wholesale
Cleaning and Maintaining you tank (thanks to Isabelle and Lynda)
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Gibbons Aquaria
http--www.aquaticplantcentral.com-forum-plant_data-all.php
All About Fish, Krill, Algae, and More: Resources for Aquarium Owners
Jones Fish and Lake Management 2004 Aquatic Plant Retail Price List
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New England Aquarium
PlantGeek.net - Plant Guide
The Krib (Aquaria and Tropical Fish)
The Tropical Tank
Tropic Isle Aquarium
What is this snail Will it eat my plants