A collection of Randy Holmes-Farley articles and ones he recommends worth a :read:
Handy Calculators (I don't claim to have written these, but they are very useful)
Reef chemicals calculator
Redirect Chemistry Calculator
Calcium Reactor setup calculator (CaCO3/CO2 reactors)
Redirect Reactor Help
General Articles
Reef Aquarium Water Parameters
Reef Aquarium Water Parameters by Randy Holmes-Farley - Reefkeeping.com
What is seawater
What is Seawater? by Randy Holmes-Farley - Reefkeeping.com
Solving Common Problems
Solving Calcium and Alkalinity Problems
http://web.archive.org/web/200211270...v2002/chem.htm
Low pH: Causes and Cures
Low pH: Causes and Cures by Randy Holmes-Farley - Reefkeeping.com
High pH: Causes and Cures
High pH: Causes and Cures by Randy Holmes-Farley - Reefkeeping.com
How to Select a Calcium and Alkalinity Supplementation Scheme
http://www.advancedaquarist.com/issues/feb2003/chem.htm
Phosphate and the Reef Aquarium
Phosphate and the Reef Aquarium by Randy Holmes-Farley - Reefkeeping.com
Nitrate in the Reef Aquarium
http://www.advancedaquarist.com/issu...t2003/chem.htm
The "How To" Guide to Reef Aquarium Chemistry for Beginners
The “How To” Guide to Reef Aquarium Chemistry for Beginners, Part 1: The Salt Water Itself
The “How To” Guide to Reef Aquarium Chemistry for Beginners Part 1: The Salt Water Itself by Randy Holmes-Farley - Reefkeeping.com
The “How To” Guide to Reef Aquarium Chemistry for Beginners, Part 2: What Chemicals Must be Supplemented
The “How To” Guide to Reef Aquarium Chemistry for Beginners Part 2: What Chemicals Must be Supplemented by Randy Holmes-Farley - Reefkeeping.com
The "How To" Guide to Reef Aquarium Chemistry for Beginners, Part 3: pH
The “How To” Guide to Reef Aquarium Chemistry for Beginners Part 3: pH by Randy Holmes-Farley - Reefkeeping.com
The “How To” Guide to Reef Aquarium Chemistry for Beginners,
Part 4: What Chemicals May Detrimentally Accumulate
The “How To” Guide to Reef Aquarium Chemistry for Beginners Part 4: What Chemicals May Detrimentally Accumulate by Randy Holmes-Farley - Reefkeeping.com
Calcium and Alkalinity
A Simplified Guide to the Relationship Between Calcium, Alkalinity, Magnesium and pH
A Simplified Guide to the Relationship Between Calcium, Alkalinity, Magnesium and pH by Randy Holmes-Farley - Reefkeeping.com
When Do Calcium and Alkalinity Demand Not Exactly Balance?
When Do Calcium and Alkalinity Demand Not Exactly Balance? by Randy Holmes-Farley - Reefkeeping.com
An Improved Do-it-Yourself Two-Part Calcium and Alkalinity Supplement System
An Improved Do-it-Yourself Two-Part Calcium and Alkalinity Supplement System by Randy Holmes-Farley - Reefkeeping.com
A Homemade Two-Part Calcium and Alkalinity Additive System
http://www.advancedaquarist.com/issu...l2004/chem.htm
Solving Calcium and Alkalinity Problems
http://www.advancedaquarist.com/issues/nov2002/chem.htm
How to Select a Calcium and Alkalinity Supplementation Scheme
http://www.advancedaquarist.com/issues/feb2003/chem.htm
Electronic Calcium Monitoring
Electronic Calcium Monitoring by Randy Holmes-Farley - Reefkeeping.com
Purity of Calcium Chloride
http://www.advancedaquarist.com/issues/mar2004/chem.htm
Calcium and Alkalinity Balance Issues
http://reefkeeping.com/issues/2002-0...ture/index.htm
Calcium Carbonate as a Supplement (Aragamight; Liquid Reactor)
http://www.advancedaquarist.com/issu...y2002/chem.htm
The Relationship Between Alkalinity and pH.
Chemistry and the Aquarium
The Chemical & Biochemical Mechanisms of Calcification in Corals
http://www.advancedaquarist.com/issues/apr2002/chem.htm
Calcium
Chemistry and the Aquarium: Calcium | Advanced Aquarist's Online Magazine
What is Alkalinity
Chemistry and the Aquarium: What is Alkalinity? | Advanced Aquarist's Online Magazine
Alkalinity Conversion Table
http://reefcentral.com/gallery/data/...5Alk_Chart.jpg
Salinity
Refractometers and Salinity Measurement
Refractometers and Salinity Measurement by Randy Holmes-Farley - Reefkeeping.com
Temperature Corrections for Hydrometers
Temperature Corrections for Hydrometers by Randy Holmes-Farley - Reefkeeping.com
Reef Aquarium Salinity: Homemade Calibration Standards
Reef Aquarium Salinity: Homemade Calibration Standards by Randy Holmes-Farley - Reefkeeping.com
Specific Gravity Measurement
Chemistry and the Aquarium: Specific Gravity: Oh How Complicated! | Advanced Aquarist's Online Magazine
Using Conductivity to Measure Salinity
Aquarium Fish International: Tropical, Freshwater and Saltwater Fish
Reef Aquarium Water Parameters (a summary general article)
Reef Aquarium Water Parameters by Randy Holmes-Farley - Reefkeeping.com
What is TDS?
http://www.reefkeeping.com/issues/20...ture/index.htm
Iron
First Iron Article: Macroalgae and Dosing Recommendations
Chemistry and the Aquarium
Second Iron Article: Iron: A Look at Organisms Other than Macroalgae
http://www.advancedaquarist.com/issues/oct2002/chem.htm
Iodine
Iodine in Marine Aquaria: Part I
Chemistry and the Aquarium
Iodine in Reef Tanks 2: Effects on Macroalgae Growth
http://www.advancedaquarist.com/issu...l2003/chem.htm
Magnesium and Strontium
Do-It-Yourself Magnesium Supplements for the Reef Aquarium
Do-It-Yourself Magnesium Supplements for the Reef Aquarium by Randy Holmes-Farley - Reefkeeping.com
Strontium and the Reef Aquarium
Chemistry and the Aquarium
Magnesium in Reef Aquaria
http://www.advancedaquarist.com/issues/oct2003/chem.htm
Magnesium and Strontium in Limewater
http://www.advancedaquarist.com/issues/dec2003/chem.htm
A Simplified Guide to the Relationship Between Calcium, Alkalinity, Magnesium and pH
A Simplified Guide to the Relationship Between Calcium, Alkalinity, Magnesium and pH by Randy Holmes-Farley - Reefkeeping.com
Limewater (kalkwasser)
What Your Grandmother Never Told You About Lime
What Your Grandmother Never Told You About Lime by Randy Holmes-Farley - Reefkeeping.com
The Self Purification of Limewater (Kalkwasser)
http://www.advancedaquarist.com/issues/may2003/chem.htm
The Degradation of Limewater (Kalkwasser) in Air
http://reefkeeping.com/issues/2003-0...ture/index.htm
Magnesium and Strontium in Limewater
http://www.advancedaquarist.com/issues/dec2003/chem.htm
How to Select a Calcium and Alkalinity Supplementation Scheme
http://www.advancedaquarist.com/issues/feb2003/chem.htm
Metals in Aquaria
Aluminum and aluminum-based phosphate binders
http://www.advancedaquarist.com/issu...y2003/chem.htm
Reef Aquaria with Low Soluble Metals
http://reefkeeping.com/issues/2003-0...ture/index.htm
Tap Water in Reef Aquaria
http://www.advancedaquarist.com/issues/jan2004/chem.htm
First Iron Article: Macroalgae and Dosing Recommendations
Chemistry and the Aquarium
Second Iron Article: Iron: A Look at Organisms Other than Macroalgae
http://www.advancedaquarist.com/issues/oct2002/chem.htm
The Self Purification of Limewater (Kalkwasser)
http://www.advancedaquarist.com/issues/may2003/chem.htm
Test Kit Reviews
The Seachem Borate Alkalinity Test Kit
http://www.advancedaquarist.com/issu...e2003/chem.htm
The Salifert Boron Test Kit
http://www.advancedaquarist.com/issu...t2003/chem.htm
Boron and Borate (and pH buffering)
Boron in a Reef Tank (and its effect on pH buffering)
http://www.advancedaquarist.com/issues/dec2002/chem.htm
The Seachem Borate Alkalinity Test Kit
http://www.advancedaquarist.com/issu...e2003/chem.htm
The Salifert Boron Test Kit
http://www.advancedaquarist.com/issu...t2003/chem.htm
Ozone
Ozone and the Reef Aquarium, Part 1: Chemistry and Biochemistry
Ozone and the Reef Aquarium, Part 1: Chemistry and Biochemistry by Randy Holmes-Farley - Reefkeeping.com
Ozone and the Reef Aquarium, Part 2: Equipment and Safety
Ozone and the Reef Aquarium, Part 2: Equipment and Safety by Randy Holmes-Farley - Reefkeeping.com
Ozone and the Reef Aquarium, Part 3: Changes in a Reef Aquarium upon Initiating Ozone
Ozone and the Reef Aquarium, Part 3: Changes in a Reef Aquarium upon Initiating Ozone by Randy Holmes-Farley - Reefkeeping.com
Others
Ammonia and the Reef Aquarium
Ammonia and the Reef Aquarium by Randy Holmes-Farley - Reefkeeping.com
Problem Dinoflagellates and pH
Problem Dinoflagellates and pH by Randy Holmes-Farley - Reefkeeping.com
Photosynthesis and the Reef Aquarium Part I: Carbon Sources
Photosynthesis and the Reef Aquarium, Part I: Carbon Sources by Randy Holmes-Farley - Reefkeeping.com
What is Skimming?
What is Skimming? by Randy Holmes-Farley - Reefkeeping.com
Hydrogen Sulfide and the Reef Aquarium
Hydrogen Sulfide and the Reef Aquarium by Randy Holmes-Farley - Reefkeeping.com
Water Changes in Reef Aquaria
Water Changes in Reef Aquaria by Randy Holmes-Farley - Reefkeeping.com
The Units of Measure of Reefkeeping
The Units of Measure of Reefkeeping by Randy Holmes-Farley - Reefkeeping.com
What is that Precipitate in My Reef Aquarium?
What is that Precipitate in My Reef Aquarium? by Randy Holmes-Farley - Reefkeeping.com
Reverse Osmosis/Deionization Systems to Purify Tap Water for Reef Aquaria
Reverse Osmosis/Deionization Systems to Purify Tap Water for Reef Aquaria by Randy Holmes-Farley - Reefkeeping.com
Reef Chemistry Quiz 2007
http://reefkeeping.com/issues/2007-01/rhf/index.php
Reef Chemistry Quiz 2006
http://reefkeeping.com/issues/2006-01/rhf/index.php
Iron Oxide Hydroxide (GFO) Phosphate Binders
Iron Oxide Hydroxide (GFO) Phosphate Binders by Randy Holmes-Farley - Reefkeeping.com
Measuring pH with a Meter
Chemistry and the Aquarium
A Comparison of pH Calibration Buffers
A Comparison of pH Calibration Buffers by Randy Holmes-Farley - Reefkeeping.com
Tap Water in Reef Aquaria
http://www.advancedaquarist.com/issues/jan2004/chem.htm
ORP and the Reef Aquarium
http://reefkeeping.com/issues/2003-1...ture/index.htm
Chloramine and the Reef Aquarium
http://reefkeeping.com/issues/2003-1...ture/index.htm
Nitrite and the Reef Aquarium
Nitrite and the Reef Aquarium by Randy Holmes-Farley - Reefkeeping.com
Silica in a Reef Tank
http://advancedaquarist.com/issues/jan2003/feature.htm
What is TDS?
http://www.reefkeeping.com/issues/20...ture/index.htm
Sea Urchins: A Chemical Perspective
Sea Urchins: A Chemical Perspective by Randy Holmes-Farley - Reefkeeping.com
Organic Compounds in the Reef Aquarium
Organic Compounds in the Reef Aquarium by Randy Holmes-Farley - Reefkeeping.com
Solutions to pH Problems
http://www.advancedaquarist.com/issu...e2002/chem.htm
Phosphorus: Algae's Best Friend
http://www.advancedaquarist.com/issu...t2002/chem.htm
The Complete Nitrogen Cycle
http://web.archive.org/web/200305101...&RecordNo=3090
Magnesium (older article with fonts screwed up)
Aquarium Fish International: Tropical, Freshwater and Saltwater Fish
Phosphate (older article now reproduced in a poor fashion)
Aquarium Fish International: Tropical, Freshwater and Saltwater Fish
Carbon Dioxide
http://web.archive.org/web/200305041...&RecordNo=2074
Using Conductivity to Measure Salinity
Aquarium Fish International: Tropical, Freshwater and Saltwater Fish
Understanding Seawater
http://web.archive.org/web/200306202.../1/default.asp
Protein Skimming: How It Works
http://web.archive.org/web/200103090...skimmers2.html