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AC:Activated carbon, chemical filtration media / alternating current

AFM:Aquarium Fish Monthly, magazine

AGA:All-Glass Aquarium, Aquarium manufacturer

ATS:Algae turf scrubber, reef setup technique


B:Boron. Micronutrient.

BB: Bare Bottom Tank (Για θαλασσινό χωρίς καθόλου άμμο)

BOD:Biological oxygen demand


Ca:Calcium. Macronutrient.


Ca(NO3)2.4H2O:Calcium Nitrate (Tetrahydrate)

CaCL2:Calcium Chloride

CaCL2.2H2O:Calcium Chloride Dihydrate

CaCL2.6H2O:Calcium Chloride Hexahydrate

CaCL2.H2O:Calcium Chloride Monohydrate

CaCO3:Calcium Carbonate

CC:Counter current, type of protein skimmer

Cl:Chloride. Micronutrient.

CO2:Carbon Dioxide, an easily dissolved gas that is a basic building block for plant growth.

CRI :color rendering index

CSL:Custom Sea Life, lighting manufacturer

CTA:Cellulose triacetate, type of RO membrane

Cu:Copper. Micronutrient.



DC:Direct current

DD:Downdraft, type of protein skimmer

DI:Deionisation, type of water purification

DIC: Dissolved Inorganic Compounds

DIY : do-it-yourself (projects)

DOC: Dissolved Organic Compounds

DOC : dissolved organic compounds

DSB:Deep Sand Bed


FAMA:Freshwater and Marine Aquaria, magazine

Fe: Iron. Micronutrient.

FFE:Flying Fish Express, Mail Order Company

FO:Fish only

FO : fish-only (tank)

FOWLR:Fish only with live rock

FOWLR : fish-only with live rock (tank)



GBR:Great Barrier Reef

GF : goldfish

GH: General Hardness (mostly representing Magnesium and Calcium salts).

GH : general hardness

GPH:Gallons per hour


H: Hydrogen. Macronutrient.

HITH : hole-in-the-head disease

HO:High output fluorescent light

HOB : hang-on-the-back (filter, equipment)

HQI:Mercury (Hg) Quartz Iodide, a type of metal halide lamp


IMHO:In My Humble Opinion

IMO:In My Opinion

IO:Instant Ocean, brand of aquarium salt


K: Potassium, a core building block for plant growth. Macronutrient.

K2HPO4:Dipotassium Phosphate

K2SO4: Potassium Sulfate. Good source of potassium for plant growth.

K2SO4:Potassium Sulphate

Kalk:Kalkwasser, German for calcium hydroxide solution or limewater

KCl: Potassium Chloride. Saltpeter. Potash. Good source of potassium for plant growth.

KCL:Potassium Chloride

KH: Carbonate Hardness.

KH2PO4: Potassium Phosphate (monobasic). Good source of Phosphate for plant growth.

KH2PO4:Monopotassium Phosphate

KNO3: Potassium Nitrate. Stump Remover. Readily available form of Potassium and Nitrate in salt form.


LFS:Local fish store

LFS/LPS : local fish store/local pet store

LHS:Local hardware store

LPH:litters per hour

LPS: large polyps stony (coral)

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

Mg: Magnesium. Macronutrient.

MgSO4: Magnesium Sulfate. Epsom Salts. Good source of magnesium for plant growth. Macronutrient.

MgSO4.7H2O:Magnesium Sulphate Heptahydrate

MH:Metal halide light

MH : metal halide

MJ:Maxijet, powerhead manufacturer

MM:Miracle Mud, method of aquarium filtration

Mn: Manganese. Micronutrient.

Mo: Molybdenium. Micronutrient.


N: Nitrogen, a core building block for plant growth. Macronutrient.

Na2HPO4:Disodium Phosphate (Anhydrous)

Na2HPO4.12H2O:Disodium Phosphate (12 Hydrate)

NaH2PO4:Monosodium Phosphate (Anhydrous)

NaH2PO4.2H2O:Monosodium Phosphate (2 Hydrate)

NH3+: Ammonia, a basic form of nitrogen available in an aquarium, formed by fish waste.

NH4+: Ammonium

Ni: Nickel. Micronutrient.

NO:Normal output fluorescent light

NO : normal output

NO2: Nitrite, the second state of nitrogen in the biological cycle in an aquarium.

NO3+: Nitrate, a common form of nitrogen available in an aquarium as a result of nitrifying bacteria breaking down ammonia.

NSW:Natural seawater

NTD : neon tetra disease


O: Oxygen. Macronutrient.

O2: Oxygen gas.


P: Phosphorus, a core building block for plant growth. Macronutrient.

PC:Power compact fluorescent light

PC : power compact

pH: Power of Hydrogen. Measure of acidity/alkalinity.

PH:Powerhead, water pump

PPM : parts per million

PVC:Poly vinyl chloride, used for piping / plumbing


QT : quarantine


RC:Reef Crystals, brand of aquarium salt

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

RO/DI : reverse osmosis/deionization

RR:Reef ready, aquaria with pre-drilled holes and overflows

RTBS : red tailed black shark

RTN:Rapid tissue necrosis, protozoal infection of corals; can be rapidly fatal if not treated

RTN : rapid tissue necrosis


S: Sulfur. Macronutrient.

SAE/CAE : siamese algae eater/chinese algae eater

SFF : siamese fighting fish

SG:Specific gravity

SG : specific gravity

SPS:Small polyped Scleractinian (stoney) coral

SPS : small polyps stony (coral)

SW:Saltwater / seawater


TB : tiger barb OR fish tuberculosis (depends on context)

TDS: Total Dissolved Solids

TDS : total dissolved solutes

TFC:Thin film composite, type of RO membrane

TWP:Tap Water Purifier from Aquatic Pharmaceuticals

TWP : tap water purification


UGF:Undergravel filter

UGF : undergravel filter

UV:Ultra violet light


VHO:Very high output fluorescent light

VHO : very high output


W/D:Wet-dry (a method of aquarium filtration)

WD:Wet-dry (a method of aquarium filtration)

WPG : watts per gallon


Zn: Zinc. Micronutrient.

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