Here are some Various DIY Pages across the net!

Acrylic

e-com plastics - FAQ's about Plastics - Plexiglas Primer

IPS Corporation - Industrial Adhesives and Cements Selection Guide - Weld-On Instructional Guide to Solvent Cementing Plastic Pipe and Fittings - Weld-On Set, Cure Times and Usage Table

Jeff Pfohl's Marine Archive - Acrylic

Northern Reef - Building with Acrylic

San Diego Plastics Inc. - Acrylic Plastic

Algae Scraper

Northern Reef - Algae Scraper

Algae Turf Scrubber

ReefKeepers - Homemade Scrubber

Air Stones

Eastern PA Reef Club - Air Diffusers

Reefman's Place - Air Diffusers

Automatic Shut Off Valve

The South Baucum Web Page - Timed Shut Off Valve

Brine Shrimp

Judy's Opening Menu - Hatching Brine Shrimp

KILLI.NET - Culturing Brine Shrimp

Peter Z's Fishline - Brine Shrimp Hatchery

Calcium Reactor

Jeff Pfohl's Marine Archive - Calcium Reactors

Marine Aquaria and Reefkeepers Society (MARS) - Calcium Reactor - Sulfur Filter

Peter Z's Fishline - Calcium Reactor

Pictures of my Reef - 15 Minute Calcium Reactor - Recirculating Calcium Reactor 

The Acropora Connection - CaCO3 Reactor

Chiller

#reefs - Chiller - Chiller

Jeff Pfohl's Marine Archive - Chillers

Hawaiian Quality Fish - Don Carner's DIY Chiller - John Rose's DIY Chiller

CO₂ Injection

Jeff Pfohl's Marine Archive - CO2 Injection Systems

Something's Fishy - Electronic Carbon Dioxide Controller

The Krib - CO2 Injection: The Yeast Method - Cheap CO2 Controller - Bubble Counter for CO2

The Original Discus Page - Do-It-Yourself Carbon Dioxide Injection

Coil Denitrator

Aquarium AquaSite - Coil Denitrator

Jeff Pfohl's Marine Archive - Coil Denitrators

Hawaiian Quality Fish - Don Carner's DIY Coil Denitrator

Peter Z's Fishline - Coil Denitrator

The Krib - Coil Denitrator

Colorimeter

Hisim's Home Page - Colorimeter

Electricity Backup

TheEpicenter.com - Build Your Own Generator

          American Power Conversion

Electronic Projects

Circuits Archive

Marine Aquaria and Reefkeepers Society (MARS) - Pump Controller

Evaporation Water Top Off

Anatomy of Reef Keeping - Water Top Off Unit

J. Charles Delbeek's Homepage - Topoff System

Janet's Reef - Auto Top Off

Jeff Pfohl's Marine Archive - Topoff

Lawrence's Reef Page - Water Top Off System

Pictures of my Reef - Gravity Feed Siphon Topoff System

Marine Aquaria and Reefkeepers Society (MARS) - Osmorégulateur

Northern Reef - RO/DI Reservoir

Saltwater Aquariums - DIY Water Top Off System

Fish Room

FINS - Fishroom

The Krib - Fish Rooms

Float Switch

ReefKeepers Emailing List - Float Switch

Fluidised Bed Filter

Peter Z's Fishline - Fluidised Bed Filter

The Cichlidroom Companion - Fluidized Biological Filter

Food

Aquacon - Home Made Fish Food Recipe

Ocean Pro Aquarium & Pond Co. - Complete Reef Nutrition

 

Food Dispenser

AquaWorld Magazine - Automated Brine Shrimp Feeder

The Breeders Registry -   Feeding Strategy for Hippocampus sp.

The Krib - Feeding Ring

General DIY

#reefs - The DIY Library - General DIY Tips - DIY Ideas

FINS - Do-It-Yourself Plans

Jeff Pfohl's Marine Archive - Index of DIY

Peter Z's Fishline - The Fishline Do It Yourself

The Krib - Plumbing and Filtration - Tank & Hardware - Lighting

The Pez's Welcome -   Miscellaneous Pictures

Kalkwasser Doser/Reactor

#reefs - Drip Doser - Drip Doser

#reefs - Nilsen Reactors

A Reefer in Dubai! - Kalk Reactor

Biochemist Online - Kalk Doser

Jeff Pfohl's Marine Archive - Dosers

Marine Aquaria and Reefkeepers Society (MARS) - Kalk Reactor

My Reef Home Page - DIY Nilsen (Kalkwasser) Reactor

Peter Z's Fishline - Simple Dosing System

Planet Reef - Calcium Dosing Methods in Reef Aquaria

Thiel Infobase - Another Method of Dosing KW

Lighting

Fluorescent

Hawaiian Quality Fish - Don's DIY Reef Type Fluorescent Lighting

Jeff Pfohl's Marine Archive - Lighting

Peter Z's Fishline - VHO Ballast Wiring - NO Ballast Wiring

The Krib - Aquarium Hood Description

Metal Halide

Reefer's Madness - Metal Halide Pendant

The Pez's Welcome - Schematic of Typical MH Hood

Power Compacts

Northern Reef - Lamp Sockets

 

Reflector

The Krib - Reflectors

Live Food

Peter Z's Fishline - Brine Shrimp Hatchery

Live Rock

#reefs - Limestone as a Live Rock Alternative

#reefs - Making Your Own Live Rock

EZ Reef - Making Your Own Live Rock - Making Your Own Live Rock and Live Sand - Homemade Conglomerate Rocks

Thiel Infobase - Making Sand Molded Aragocrete Live Rocks

Magnetic Stirrer

Hisim's Home Page - Magnetic Stirrer (Modification instructions)

Oxygen Reactor

Aquarium AquaSite - Oxygen Reactor

Hawaiian Quality Fish - Don's DIY Oxygen Reactor

Ozone Reactor

Aquarium AquaSite - Ozone Reactor

Overflow

#reefs - Overflow Box - Micro Reef Surface Skimmer - Internal Overflow - Surface Skimmer

Dogs Reef Pages - Dog's Overflow Page

Eastern PA Reef Club - DIY Overflow

Jeff Pfohl's Marine Archive - Overflow Box

My Reef Home Page - Reef Devil 3 Overflow/Filter Plans

Norablue - DIY Wet/Dry and Overflow

Peter Z's Fishline - Surface Skimmer

Richard Durso's 180g Reef Tank Site - Custom Overflow

The Krib - Overflow Skimmers - Quieting Overflow Skimmers

The Pez's Welcome - Quiet Overflow

pH Meter

 

Protein Skimmer

Counter Current - Air Stone

Aquaria Central - Protein Skimmer Diagram - Protein Skimmer Diagram

 

Dogs Reef Pages - Dog's Skimmer Page

Eastern PA Reef Club - DIY Skimmer

Harbour Aquatics - Counter Current Skimmer

J. Charles Delbeek's Homepage - Larry Jackson's Foam Fractionator

Jeff Pfohl's Marine Archive - Skimmers

Peter Z's Fishline - Counter Current Skimmer

Planet Reef - How to Build a Protein Skimmer

Downdraft

Aqualink - DIY Downdraft Skimmer

Jeff Pfohl's Marine Archive - Downdraft Description - Downdraft Image

Peter Z's Fishline - Downdraft Skimmer

Pictures of my Reef - Small Downdraft Skimmer

High Speed Aeration

Creative Reefs (The Reef Guy) - HSA Skimmer

Eastern PA Reef Club - HSA Style Skimmer

Jeff Pfohl's Marine Archive - HSA- Foam Jet

Pictures of my Reef - Potential Skimmer Injectors

 

Modifications

Northern Reef - Seaclone Modifications

Venturi

A Reefer in Dubai! - Skimmer

Eastern PA Reef Club - DIY Skimmer

FINS - Joseph S. Sellinger's Skimmer Design 5

Harbour Aquatics - Leon Mack's Skimmer Design

Marine Aquaria and Reefkeepers Society (MARS) - Super Skimmer

Peter Z's Fishline - Venturi Skimmer

Planet Reef - How to Build a Protein Skimmer

The Krib - Venturi Skimmer

Pump

The Krib - Archimedes Screw Pump

Pump Outlet Oscillator

Alberts1 Webpage - DIY Rotor Head

Sponge Filter

The Krib - Sponge Filter

Sump

Creative Reefs (The Reef Guy) - DIY Sump

Dogs Reef Pages - Dog's Sump Page

Monolith Marine Monsters - DIY Sump

Peter Z's Fishline - Simple DIY Sump

Richard Durso's 180g Reef Tank Site -  Previous Sumps

The Pez's Welcome - My Sump

Surge Device

No Web Site - David Lee's Surge Wave Maker

AquaTouch - Surge Bucket Plans

Jeff Pfohl's Marine Archive - Surge- Carlson Box

Pictures of my Reef - Surge Project

Planet Reef - Building a SImple Surge Device

The Breeders Registry - How to Build a Powerful Surge Device - A Simple Surge Device

Tank

Aquaria Central - DIY Tank Hints - Indoor Pond

Geothermal Aquaculture Research Foundation - 140 Gallon Aquarium Construction

Jeff Pfohl's Marine Archive - Build Big Tank - Tanks

Northern Reef - LT1, a Self-Contained Aquarium

ReefKeepers Emailing List - Plywood Tanks

Saltwater Aquariums - Do-It-Yourself Aquarium

The Krib - Wood Tanks - Yet Another DIY Wood Tank - Glass Thickness - Glass Tanks - Plexiglass/Acrylic

The Original Discus Page - Building Your Own Tanks

Tank Hood

#reefs - Tank Canopy - Securing Lift Top Hood with Open Back

Aquaria Central - DIY Canopy

Creative Reefs (The Reef Guy) - DIY Canopy

Eastern PA Reef Club - DIY Tank Canopy

Grant's Tank - Rain Gutter Hood Design

Jeff Pfohl's Marine Archive - Hoods

Peter Z's Fishline - Aquarium Hood

ScubaRaven's Reef - 100g Fishstand

The Krib - Homemade Aquarium Canopy - Do It Yourself Canopy - Light Hood

Tank Layout

Peter Z's Fishline - System Setup

Scott Harris's Reef Aquarium Home Page - Schematic Diagram of My 75 Gallon Reef Aquarium

The Pez's Welcome - Current Schematic of My Tank

Tank Stand

Chris Freyer's Website - Building a Stand

Creative Reefs (The Reef Guy) - DIY Stand

Eastern PA Reef Club - Fishstand

Geothermal Aquaculture Research Foundation - Aquarium Stand Construction

Jeff Pfohl's Marine Archive - Stands

Larry's Web Page - DIY Aquarium Stand

Northern Reef - Tank Stand

ScubaRaven's Reef - 100g Fishstand

The Krib - Stands

Temperature Controller

Brett Bymaster's Circuits and Software - Thermostat Circuit

Marty's Homebrew Gadgets Page - Refrigerator Temperature Controller Plans

Thermometer

Marty's Homebrew Gadgets Page - Electronic Thermometers for Brewers

Trace Element Doser

Jeff Pfohl's Marine Archive - Trace Doser

Marine Aquaria and Reefkeepers Society (MARS) - Automatic Doser

Peter Z's Fishline - Fancy Doser

The Krib - Doser

Traps

The Krib - Traps

Under Gravel Filter

Saltwater Aquariums - UGF

Wavemaker

John Rice Reef Page - DIY Wavemaker

Norm's Reef Pages - Current Maker

Peter Z's Fishline - Wave Maker Schematic

Wet/Dry Filter

#reefs - Bio Ball Replacement

Aquaria Central - Wet/Dry Trickle Filter Plans - Diagram of Trickle Filter

Creative Reefs (The Reef Guy) - DIY Sump

FINS - Diagram of Trickle Filter

Jeff Pfohl's Marine Archive - Trickle

Norablue - DIY Wet/Dry and Overflow

The Krib - Wet-Dry Filter- DIY Trickle Filter

 

Thanks to Oz Reef For the Links