AC   Activated carbon, chemical filtration media / alternating current
AFM   Aquarium Fish Monthly, magazine
AGA   All-Glass Aquarium, Aquarium manufacturer
AL   Aqualink, aquarium bulletin board
ATS   Algae turf scrubber, reef setup technique
BOD   Biological oxygen demand
CC   Counter current, type of protein skimmer
CSL   Custom Sea Life, lighting manufacturer
CTA   Cellulose triacetate, type of RO membrane
Cyano   Cyanobacteria
DC   Direct current
DD   Downdraft, type of protein skimmer
DI   Deionisation, type of water purification
DIY   Do it yourself
DSB   Deep Sand Bed
FAMA   Freshwater and Marine Aquaria, magazine
FFE   Flying Fish Express, Mail Order Company
FO   Fish only
FOWLR   Fish only with live rock
FW   Freshwater
GBR   Great Barrier Reef
GPH   Gallons per hour
HO   High output fluorescent light
HQI   Mercury (Hg) Quartz Iodide, a type of metal halide lamp
IA   Inland Aquatics, mail order company
IMHO   In My Humble Opinion
IMO   In My Opinion
IO   Instant Ocean, brand of aquarium salt
IR   Infrared
Kalk   Kalkwasser, German for calcium hydroxide solution or limewater
LFS   Local fish store
LHS   Local hardware store
LPS   Large polyped Scleractinian (stoney) coral
LR   Live rock
LS   Live sand
MACNA   Marine Aquaria Conference of North America, held annually
MASNA   Marine Aquarium Societies of North America
MD   Marine Depot, mail order company
MH   Metal halide light
MJ   Maxijet, powerhead manufacturer
MM   Miracle Mud, method of aquarium filtration
MO   Mail order
NO   Normal output fluorescent light
NSW   Natural seawater
PA   Premium Aquatics, mail order company
PC   Power compact fluorescent light
PH   Powerhead, water pump
PVC   Poly vinyl chloride, used for piping / plumbing
RC   Reef Central, aquarium bulletin board supreme
RC   Reef Crystals, brand of aquarium salt
RDO   Reefs.org ("reefs-dot-org"), aquarium bulletin board
RK   Reef Keeping, on-line aquarium magazine
RO   Reverse osmosis, type of water purification
RO/DI   Reverse osmosis, followed by deionisation, type of water purification
RR   Reef ready, aquaria with pre-drilled holes and overflows
RTN   Rapid tissue necrosis, protozoal infection of corals; can be rapidly fatal if not treated
SG   Specific gravity
SPS   Small polyped Scleractinian (stoney) coral
SW   Saltwater / seawater
TBS   Tampa Bay Saltwater, Mail Order Company
TFC   Thin film composite, type of RO membrane
TRT   The Reef Tank, aquarium bulletin board
TWP   Tap Water Purifier from Aquatic Pharmaceuticals
UGF   Undergravel filter
UV   Ultra violet light
VHO   Very high output fluorescent light
W/D   Wet-dry (a method of aquarium filtration)
WD   Wet-dry (a method of aquarium filtration)


Some Others:

CDMAS Capital Disctrict Marine Aquarist Society (Thats us!)
HVRK Hudson Valley Reef Keepers   (Our Friends and Neighbors to the South)
URS Upstate Reef Society (A large club mostly from Western NY)
softies a term used to refer to unrelated soft corals with similar requirements includes leathers mushrooms star polyps xenias, glove polyps and zooanthids

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