Here is the list I have have come across:
AC-Activated Carbon
ALK=Alkalinity
BOD Biologicial Oxygen Demand
BTA=Bubble Tip Anemone
BTW=By The Way
Ca=Calcium
CBS Coral Banded Shrimp
CC = Crushed Coral
CCS = Chocolate Chip Star
Cl = Chlorine
CO2 = Carbon dioxide
CO3 = Carbonate
Cu = Copper
CYANO = Cyanobacteria
DC = Direct Current
DI = Deionisation
DIY = Do it Yourself
dKH = DEgrees of Caronate Hardness
DO = Dissolved Oxygen
DSB = Deep Sand Bed
Fe = Iron
FO = Fish Only
FOWLR = Fish Only With Live Rock
FW = Fresh Water
FWIW = For What It's Worth
FYI = For Your Information
GAC = Granular Activated Carbon
GAL = Gallon
GBR = Great Barrier Reef
GPH = Gallons per Hour
GSP = Green Star Polyps
HO = High Output Fluorescent Light
HT = Hospital Tank
HTH = Hope This Helps
HOT = Hang on Tank
HYPO = Hyposalinity
I = Iodide
I2 = Iodine
IME = In My Experiene
IMHO = In My Honest Opinion
IMO = In My Opinion
IR = Infrared
JK = Just Kidding
KALK = Kalkwasser
KI = Potassium Iodide
LFS = Local Fish Store
LHS = Local Hardware Store
LOL = Laughing Out Loud
LPH = Liter Per Hour
LPS = Large Polyped Scleractinian or Local Pet Shop
LR = Live Rock
LS = Live Sand
LT = Litre
MEQ/L = Milli equivalents per litre
Mg = Magnesium
Mg/L = Milligrams per litre
MH = Metal Halide
MO = Mail Order
Na = Sodium
NH3 = Ammonia
NH4 = Ammonium
NO = Normal Output
NO2 = Nitrite
NO3 = Nitrate
NSW = Natural Seawater
O2 = Oxygen
PBT = Powder Blue Tang
PC = Power Compact
pH = Concentration of Hydrogen Ions
PH = Powerhead
PLS = Please
PO4 = Phosphate
QT = Quarantine Tank
OT = Off Topic
PPM = Part per Million
PVC = Poly Vinyl Chloride
RO = Reverse Osmosis
RO/DI = Reverse Osmosis/Deionisation
ROFL = Rolling On The Floor Laughing
RUGF = Reverse Flow Undergravel Filter
SAL = Salinity
SG = Specific Gravity
SHO = Super High Output Fluorescent lighting
Si = Silicon
SPS = Small Polyped Scleractinian
Sr = Strontium
SW = Saltwater
TDS = Total Dissolved Solids
TIA = Thanks In Advance
TY = Thank You
UGF = Under Gravel Filter
UV = Ultra Violet (lights)
VHO = Very High Output Fluorescent Lights
W= Watts
WTB = Want to Buy
|