How about an Abreviation list too, Nin9d has a list up on his site if we asked him permission to use it I wonder if he'll let us. I will paste a portion of it here.
Acro
Acropora, a type of SPS coral
AGA
All-Glass Aquarium, aquarium manufacturer
ALK
Alkalinity, measure of buffering capacity of water
BTA
Type of anemone (Entacmaea quadricolor) / bubble-tipped, bulb tentacle, bulb tip
BTW
By the way
Ca
Calcium
CaCl2
Calcium chloride
CaCO3
Calcium carbonate
Ca(OH)2
Calcium hydroxide
CC
Crushed coral
Cl
Chlorine
CO2
Carbon dioxide
CO3
Carbonate
Cu
Copper
CYANO
Cyanobacteria
DE
Double ended metal halide metal bulb
DI
Deionization, type of water purification
DIY
Do it yourself
dKH
Degrees of carbonate hardness, measure of alkalinity
DO
Dissolve oxygen
DOC
Dissolved organic carbon
DSB
Deep sand bed
FAQ
Frequently asked questions
Fe
Iron
FO
Fish only, type of marine aquarium
FOWLR
Fish Only with Live Rock
frag(s)
Broken or cut pieces of coral which will eventually grow into a new animal
"fuge"
Short for refugium
FW
Freshwater
FWIW
For what its worth
FYI
For your information
GAL
Gallon
GFCI/GFI
Ground fault circuit interrupter / Ground fault interrupter
GPH
Gallons per hour
GSP
Green star polyps
HCO3
Hydrogen carbonate
HD
Home Depot
HID
High intensity discharge, type of light
HO
High output fluorescent light
HOB
Hang on back, some types of skimmer and filters
HQI
High quartz iodide, type of light
I
Iodide
I2
Iodine
ID
Identify/Identity
IME
In my experience
IMO
In my opinion
IMHO
In my honest opinion
IO
Instant Ocean, brand of synthetic salt mix
IR
Infrared, type of light of longer wavelength than visible light
IRC
Internet relay chat
JME
Just my experience.
JMO
Just my opinion.
K
kelvin (mechanism for measuring spectrum of lighting, should be labeled degrees K) / Potassium
KALK
Kalkwasser, German for calcium hydroxide solution or limewater
KI
Potassium iodide
KISS
Keep it simple stupid
L
Liter
LED
Light emiting diode
LFS
Local fish store
LHS
Local hardware store
LMAO
Laughing my *** off
LOL
Laughing out loud
LPS
Large polyped stoney coral
LR
Live rock
LS
Live sand
LT
Litre
LTA
Long tentacle anemone
MACNA
Marine Aquaria Conference of North America, held annually
MEQ/L
Milli-equivalents per litre, measure of alkalinity
Mg
Magnesium
Mg/L
Milligrams per litre
MH
Metal halide light
MJ
Maxijet, powerhead manufacturer
MM
Miracle Mud, method of aquarium filtration
MO
Mail order
MV
Mercury vapor, type of light
Na
Sodium
NaCO3
Sodium carbonate
NaOH
Sodium hydroxide
NH3
Ammonia
NH4
Ammonium
NNR
Natural nitrate reduction, reef setup technique
NO
Normal output fluorescent light
NO2
Nitrite
NO3
Nitrate
NP
No problem
O2
Oxygen
ORP
Oxidation reduction potential, the ability to take or give electrons
PAR
Photosynthetically active radiation, lighting quantity
PC
Power compact fluorescent light
PFO
Lighting manufacturer
pH
Measure of the concentration of hydrogen ions, equal to -log[H+]
PH
Powerhead, water pump
PITA
Pain in the @ss
PLS
Please
PO4
Phosphate
"pods"
Non-specific types of copepods, amphipods and such
POS
Piece of doodoo
PPM
Parts per million, equivalent to mg/l (milligrams per litre)
PUR
Photosynthetically usuable radiation, lighting quantity
PVC
Poly vinyl chloride, used for piping / plumbing
RC
Reef Central
RO/DI
Reverse osmosis, deionization water purification
ROFL
Rolling on the floor laughing
ROFLOL
Rolling on the floor laughing out loud
ROTFL
Rolling on the floor laughing
ROFLMAO/ROTFLMAO
Rolling on the floor laughing my *** off
RR
Reef ready, aqaurium with pre-drilled holes and overflows
RTN
Rapid tissue necrosis
SCWD
Switching Current Water Director, type of wave machine
SE
Single ended, lighting designation
SG
Specific gravity
SHO
Super high output fluorescent light, equivalent to power compact fluorescent
SPS
Small polyped stoney coral
SW
Saltwater
TBS
Tampa Bay Saltwater Live rock company
TDS
Total Dissolved Solids
TM
Tropic Marin, manufacturer of fresh and saltwater products
TTYL
Talk to you later
UGF
Undergravel filter
UV
Ultra violet, type of light of shorter wavelength than visible light
VHO
Very high output fluorescent light
W
Watts
WD ( W/D )
Wet dry, method of aquarium filtration
WPG
Watts per gallon, lighting quantity
WTF
What the F**K
WTH
What the hell
WYSIWYG
What you see is what you get