This is for the newbies out there that might be confused at all of these acronyms that fellow reefers use. So here is a list of common acronyms that are used here on reef2reef. I hope this helps! :3 Acronym list # .02 - My two cents A A - Amp AA - Amino Acid ABT - Atlantic blue Tang AC - Activated Carbon AC - Alternating Current Acan Lord â€“ Acanthastrea Acro- Acropora coral [FONT="]AEFW â€“ Acropora (Acro)[/FONT] Eating Flatworms AGA - All-Glass Aquarium AIO â€“ all in one Alk - Alkalinity ATO - Auto Top Off ATS - Algae Turf Scrubber B BA - Bubble algae BB - Bare Bottom Blasto â€“ Blastomussa BRS â€“ bulk reef supplies (online store) BTU - British Thermal Unit C Ca - Calcium CBB - Copper Band Butterfly CC - Counter Current CC - Crushed Coral CFL - Compact Fluorescent Lamp CL - Closed Loop CO2 - Carbon Dioxide Cu - Copper CUC - Clean Up Crew CWC - continuos water change Cyano â€“ Cyanobacteria D DC - Direct Current DD - Downdraft DE - Double Ended DFS - Drs. Foster and Smith DI â€“ Deionization DI water â€“ deionized water DIY - Do It Yourself dKh - German Degrees of Hardness DO - Dissolved Oxygen DOC - Dissolved Organic Carbon DSB - Deep Sand Bed DT - display tank E ETA - Estimated Time of Arrival. F FO - Fish Only FOWLR - Fish Only With Live Rock Frag - Fragment (a small part of a coral colony removed in order to grow another colony) FTS - Full Tank Shot FTW- for the win Fuge = refugium FW - Freshwater FWE=Flat Worm Exit FWIW-For what its worth G G- Gallon (ex. 60g) GAC - Granular Activated Carbo GBTA â€“ Green Bubble Tip anemone GFCI - Ground Fault Circuit Interrupter GFI - Ground Fault Interrupter GFO - Granular Ferric Oxide GHA - Green Hair Algae GPD - Gallons Per Day GPH - Gallons Per Hour GSM-Gold Strip Maroon Clownfish GSP - Green Star Polyps H HA - Hair Algae HID â€“ High intensity discharge HO - High Output HOB - Hang On Back HOT - Hang On Tank HTH = Hope that helps HQI â€“ Hardest question is HQI - Mercury (Hg) Quartz Iodide I IME - In my experience IMHO - In my humble opinion IMO- In my opinion IO - Instant Ocean IR - Infrared IW - In Wall K K - Kelvin kWh - Kilowatt-Hour L L â€“ Liters LED â€“ light emitting diodes LFS â€“ local fish store LMK â€“ let me know Lobo â€“ Lobophyllia LOL - Laugh out loud. LPS â€“Large polyp stony have large and soft polyps LR - Live Rock LS - Live Sand LTA - Long Tentacle Anemone M MACNA - Marine Aquaria Conference of North America MASNA - Marine Aquarium Societies of North America meq/L - Micro-equalities per Liter Mg or Mag - Magnesium MH - Metal Halide light Milli - Acropora Millipora MJ â€“ Maxijet N Nems- anemones NH3 - Ammonia NNR - Natural Nitrate Reduction NO - Normal Output NO2 - Nitrite NO3 - Nitrate NPS - Non Photosynthetic O O2 â€“ Oxygen ORA- oceans, reefs, and aquariums ORP - Oxygen Redox Potential P P04 â€“ Phosphate PAR - Photosynthetic Active Radiation PBT-Powder Blue Tang PC - Power Compact POTM - Picture of the month PP - per polyp PPM - Parts Per Million PPT - Parts Per Thousand PVC - Poly Vinyl Chloride Q QT - Quarantine Tank R R2R â€“ Reef to reef (.com) RBTA - Rose Bubble tip anemone RC - Reef Crystals RDSB - Remote Deep Sand Bed Rics â€“ Ricordia RO water â€“ reverse osmosis water RODI - Reverse Osmosis, Deionization ROTFLMBO - Roll on the floor laughing my butt off RR - Reef Ready RTN - Rapid Tissue Necrosis S SE - Single Ended SG - Specific Gravity Shrooms â€“ Mushrooms SPS - small polyp stony â€“branch out or plate and have small polyps SSB - Shallow Sand Bed STN - Slow Tissue Necrosis SW - Salt Water / Sea Water T TDS - Total Dissolved Solids TFC - Thin Film Composite TIA = Thanks in advance TMI - Too much information TOTM - Tank of the month Trachy â€“ Trachyphyllia U ULNS - Ultra Low Nutrient System UV - Ultra Violet V V - Volt VHO - Very High Output (fluorescent light) W W - Watts WC - Water Change Wellso â€“ Wellsophyllia WYSIWUG - what you see is what you get Y YGPM - You've Got Private Message YWG-Yellow Watchman Goby Z Z&P - Zoanthids and palythoa Zoa - [FONT="]Zoanthid Coral[/FONT] Thanks to: Raggamuffin, Wy Renegade, Swannyson, Skinz78, Tabasco 1, Jordan 3548, fsu1dolfan, Stray40, and Rayzback for their contributions to the list.