AGA - All-Glass Aquarium, aquarium manufacturer
ALK - Alkalinity
Ballast - An electrical device for starting and regulating fluorescent and discharge lamps
BB - Bare Bottom
BTA - Bubble tip anemone
Ca - Calcium
CC - Crushed coral substrate
Cyano - Cyanobacteria
DIY - Do it yourself
DOS - Dissolved organic solids
DSB - Deep sand bed. Generally 4 inches or deeper.
FO - Fish only
FOWLR - Fish only with live rock. An aquarium with no significant corals.
Frag - A fragment of a parent coral, or small coral.
FW - Freshwater
GFI - Ground fault interrupt
GPH - Gallons per hour, for measuring pumps.
GSP - Green Star Polyps
HA - Hair Algae
HD - Home Depot, home improvement store
HOB - Hang on back filter
HTH - Hope this helps (forum lingo)
Ick - Cryptocaryon Irritans Paracite (or ich)
IM - Instant message (forum lingo)
IMHO - In my honest opinion (forum lingo)
IMO - In my opinion (forum lingo)
IO - Instant Ocean, a brand of salt mix
J/K - Just kidding (forum lingo)
Kalk - Kalkwasser, a calcium hydroxide solution, limewater
LFS - Local Fish Store
LOL - Laugh out loud (forum lingo)
LPS - Large Polyped Stoney (coral)
LR - Live rock
LS - Live sand
MH - Metal Halide lighting
Newbie - A beginner
NO - Normal Output fluorescent lighting
NO2 - Nitrite
NO3 - Nitrate
NSW - Natural sea water
Nudi - See Nudibranch
Nudibranch - Marine gastropods (Nudibranchia) having no shell of various color and size
OC - Orange Crush
ORP - Oxidation Reduction Percetage (disolved orgainc breakdown time)
PAR - Photosynthetically Active Radiation
PC - PowerCompact fluorescent lighting
pH - Potential of Hydrogen
pH - Percent Hydroxide, a measure of alkaline/acid ballance of water
PM - Private message (forum lingo)
PPM - Parts Per Million
PVC - Poly vinyl chloride, a type of pipe used for plumbing aquariums
Reflector - Something having a polished surface for reflecting light
RO - Reverse osmosis filtration. RO systems are used to purify tap water before use in an aquarium.
RO/DI - Reverse osmosis with de-ionization. Used to purify tap water before being used in an aquarium.
RTN - Rapid Tissue Necrosis
SG - Specific Gravity, a measure of the amount of salt in water.
Shroom - A mushroom coral
Softies - Soft corals
SPS - Small Polyped Stoney (coral)
Starphire - PPG's high clarity glass which comes from minimal iron impurities
STN - Slow Tissue Necrosis
SW - Saltwater
T5HO - T5 High Output Lighting
TDS - Total Dissolved Solids
UGF - Under-gravel filter
VHO - Very High Output fluorescent lighting
W/C - Water change
Wet/Dry - A method of aquarium filtration
YGM - You've got mail (forum lingo)
Zoos - Short for Zoanthids
maybe i should start place this one the the information page