Water Chemistry 
Photo provided by Pogodzib A Simplified Guide to the Relationship Between Calcium, Alkalinity, Magnesium and pH by Randy Holmes-Farley Chemistry and the Aquarium kalkwasser An Improved Do-it-Yourself Two-Part Calcium and Alkalinity Supplement System by Randy Holmes-Farley Reef Chemistry Calculator Advanced Aquarist Feature Article "SILICA IN REEF AQUARIUMS" by RANDY HOLMES-FARLEY, Ph.D.
Reef Chemistry Articles Randy Holmes-Farley does all the work, so that we can do all the reading!
Tullock, John.
Water Chemistry for the Marine Aquarium (Hauppauge: Barron's, 2002).
Beginner FAQ: The Nitrogen Cycle Nutrient Management 
Photo provided by Pogodzib An Instant Nitrate Reduction Method - A Multiple Step Water Change Procedure NutrientControl Advanced Aquarist's Online Magazine - Feature Article: The "Old Tank" Syndrome Dosing Sugar or Vodka The Old Becomes New, Yet Again: Sandbeds and Vodka by Eric Borneman - Reefkeeping.com Nitrates! « Joe Jaworski’s Weblog Natural Filtration (Substrates) 
Photo provided by e_baer About Live Rock - Live Rock DSB article - CALFO Deep Sand Beds Aquarium Frontiers On-Line: October 1997: Without A Backbone "What Lives in Live Sand?"
Advanced Aquarist's Online Magazine - Feature Article: An Experimental Comparison of Sandbed and Plenum-Based Systems. Part 1: Controlled lab dosing experiments Reef Builders Blog about saltwater fish, Marine Hobby & Aquarium » Blog Archive » Substrates in Aquariums–Plenums, DSBs & Barebottom Aquaria LiveSand MarSubstr "Substrates for Marine Aquariums"
Sanbeds and Bare Bottom Tanks - Reef Hobbyist Online Magazine deep sand bed@Everything2.com DeepSandBeds
Calfo, Anthony. "All About Sand Bed Filters."
Coral 4, no. 5 (2007): 36-40.
Shimek, Ronald. "How Sand Beds Really Work."
Coral 4, no. 5 (2007):26-35.
How Sandbeds REALLY Work by Ronald L. Shimek, Ph.D. - Reefkeeping.com The Natural Mud-Filter Method Live Rock As A Biological Filter: Hit or Myth? by Ronald L. Shimek, Ph.D.. - Reefkeeping.com Refugium Substrates