A 335,000 U.S. gallon (1.3 million liter) aquarium at the Monterey Bay Aquarium in California displaying a simulated kelp forest ecosystemSouth East Asian fish in the aquarium at Bristol Zoo, Bristol, England. The tank is about 2 metres (6 feet) high.Koi have been kept in decorative ponds for centuries in China and Japan.

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Aquarium Meters, Regulators

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Neptune Pm2 ModuleNeptune Pm2 Module $85.99 Digital Aquatics Archon Aquarium ControllerDigital Aquatics Archon Aquarium Controller $51.00
AutoTopoff Nano - Auto Top Off Ato Water Level Controller for Reef AquariumAutoTopoff Nano - Auto Top Off Ato Water Level Controller for Reef Aquarium $40.00 Smart Skimmer Security Optical On/Off Sensor Protein - AutoaquaSmart Skimmer Security Optical On/Off Sensor Protein - Autoaqua $59.99
Pinpoint Orp Redox 400 Calibration FluidPinpoint Orp Redox 400 Calibration Fluid $4.99 Autoaqua Smart Ato Micro - Automatic Top Off System Magnetic Full Kit W/PumpAutoaqua Smart Ato Micro - Automatic Top Off System Magnetic Full Kit W/Pump $100.00
1Pc Mini Digital Lcd Thermometer Hygrometer Humidity Temperature Meter Tester Us1Pc Mini Digital Lcd Thermometer Hygrometer Humidity Temperature Meter Tester Us $4.99 Qooltek Digital Lcd Thermometer Temperature Gauge Aquarium Thermometer with ProbQooltek Digital Lcd Thermometer Temperature Gauge Aquarium Thermometer with Prob $12.73
Dual Aquarium Fish Tank Thermometer Temperature Sticker Stick-on Fahrenheit °FDual Aquarium Fish Tank Thermometer Temperature Sticker Stick-on Fahrenheit °F $2.54 Hanna Instruments Ultra Low Range Phosphate Checker Ulr Hi774, Saltwater ReefHanna Instruments Ultra Low Range Phosphate Checker Ulr Hi774, Saltwater Reef $49.95
Glass Saltwater Hydrometer Thermometer - Aquarium reef Soft Coral Fish Tank TestGlass Saltwater Hydrometer Thermometer - Aquarium reef Soft Coral Fish Tank Test $8.99 Dc16 Lcd Digital Waterproof Fish Tank Aquarium Water Temperature Thermometer UsDc16 Lcd Digital Waterproof Fish Tank Aquarium Water Temperature Thermometer Us $6.99
Marina Thermometer Floating Cup Suction Aquarium Fish Tank Temperature IndicatorMarina Thermometer Floating Cup Suction Aquarium Fish Tank Temperature Indicator $5.10 Us Lcd Digital Fish Tank Reptile Aquarium Water Meter Thermometer Temperature RqUs Lcd Digital Fish Tank Reptile Aquarium Water Meter Thermometer Temperature Rq $7.08 to $30.67
Neptune Systems Apex Lite Aqua ControllersNeptune Systems Apex Lite Aqua Controllers $30.00 3X Aquarium Lcd Digital Fish Thermometer Water Terrarium Black Free Batteries3X Aquarium Lcd Digital Fish Thermometer Water Terrarium Black Free Batteries $7.89
Milwaukee Mc122 pH Controller 115V, for Co2 Dosing/Monitor/Meter/Inst rumentsMilwaukee Mc122 pH Controller 115V, for Co2 Dosing/Monitor/Meter/Inst ruments $130.00 4 Tiny Seas Lcd Digital Aquarium Temperature Thermometer 4 Free Extra Batteries4 Tiny Seas Lcd Digital Aquarium Temperature Thermometer 4 Free Extra Batteries $10.85
Hm Digital pH Electrode Storage Solution (60cc)Hm Digital pH Electrode Storage Solution (60cc) $9.95 Trending at $10.99 Luster Leaf Soil Test Kit Tester pH Test Light The Rapitest #1601 (40 Test)Luster Leaf Soil Test Kit Tester pH Test Light The Rapitest #1601 (40 Test) $13.73 Trending at $14.99
Tunze Osmolator Universal 3155 Marine Aquarium Auto Top - Off System Water levelTunze Osmolator Universal 3155 Marine Aquarium Auto Top - Off System Water level $199.99 Lcd 3D Crystal Digital Electronic Aquarium Thermometer Fish Tank Temp MeterLcd 3D Crystal Digital Electronic Aquarium Thermometer Fish Tank Temp Meter $5.99
ApexEl Controller - Neptune Apex Controller Wifi Model - Entry LevelApexEl Controller - Neptune Apex Controller Wifi Model - Entry Level $499.95 Neptune Systems Apex Aquarium Controller Classic, Fmm Module.Neptune Systems Apex Aquarium Controller Classic, Fmm Module. $59.00
Jbj Ato Automatic Top Off System Water Level Controller A.T.O for Fish TankJbj Ato Automatic Top Off System Water Level Controller A.T.O for Fish Tank $79.24 Trending at $87.99 Aquatop Floating Glass Aquarium Thermometer w/ Suction Cup Mount Free ShippingAquatop Floating Glass Aquarium Thermometer w/ Suction Cup Mount Free Shipping $6.95
Led Digital Waterproof Fish Aquarium Guage Water Tank Temperature Thermometer UsLed Digital Waterproof Fish Aquarium Guage Water Tank Temperature Thermometer Us $7.89 Auto-top-off Ato Solution Water filler Float Valve Aquarium Tank Sump AdjustableAuto-top-off Ato Solution Water filler Float Valve Aquarium Tank Sump Adjustable $21.02
Milwaukee- Mw600 Dissolved Oxygen Do Meter - Checker TesterMilwaukee- Mw600 Dissolved Oxygen Do Meter - Checker Tester $172.00 Ghl dosing slave unit 2.1Ghl dosing slave unit 2.1 $250.00
Aquarium Thermometer Digital Touch Screen Fish Tank W Large Lcd Display Stick OnAquarium Thermometer Digital Touch Screen Fish Tank W Large Lcd Display Stick On $22.94 5/10x Aquarium Fish Tank Thermometer Temperature Sticker Stick-on Fahrenheit Us5/10x Aquarium Fish Tank Thermometer Temperature Sticker Stick-on Fahrenheit Us $5.07 to $6.04 Was:  Previous Price $6.49
Dos Replacement Pump Head CapDos Replacement Pump Head Cap $17.00 Marinepure Biofilter 1.5" Spheres (2 Quart) Aquarium Filter Media - CermediaMarinepure Biofilter 1.5" Spheres (2 Quart) Aquarium Filter Media - Cermedia $28.95
New listing
		Tropic Marin Glass Thermometer Precision German Water Temperature InstrumentNew listing Tropic Marin Glass Thermometer Precision German Water Temperature Instrument $37.49 Seneye Reef MonitorSeneye Reef Monitor $57.00
Salinity Refractometer, Aquarium & Seawater - Dual Scale (1.0 to 1.070 S.G.)Salinity Refractometer, Aquarium & Seawater - Dual Scale (1.0 to 1.070 S.G.) $18.99 Mardel in-tank Ammonia Meter, 4 - 6 Week MeterMardel in-tank Ammonia Meter, 4 - 6 Week Meter $5.75
Tunze Osmolator Universal Ato 3155 - Aquarium Water Refill System Auto Top OffTunze Osmolator Universal Ato 3155 - Aquarium Water Refill System Auto Top Off $199.99 Apex Neptune 1 LinkApex Neptune 1 Link $1.25
Digital Aquatics Ioe (Input/Output Extender)Digital Aquatics Ioe (Input/Output Extender) $5.00 New Neptune Apex Lab Grade Orp ProbeNew Neptune Apex Lab Grade Orp Probe $65.00
Hi772-26 Marine Alkalinity Checker Hc Reagent 25 Tests Hanna InstrumentsHi772-26 Marine Alkalinity Checker Hc Reagent 25 Tests Hanna Instruments $12.49 Fusion Smart Temp ThermometerFusion Smart Temp Thermometer $6.49
Apex Dos & Ddr Combination Brand New Still In Original wrapperApex Dos & Ddr Combination Brand New Still In Original wrapper $350.00 teffo; Aquarium Temperature Controller w/Magnetic Sen
00006000
sor;WiFi Thermometer;2-Stagteffo; Aquarium Temperature Controller w/Magnetic Sen 00006000 sor;WiFi Thermometer;2-Stag $39.99
Instant Ocean - Hydrometer - 1 UnitInstant Ocean - Hydrometer - 1 Unit $9.99 Tunze Osmolator Nano 3152 - Aquarium Automatic Refill System Ato Auto Top OTunze Osmolator Nano 3152 - Aquarium Automatic Refill System Ato Auto Top O $97.46
pH Electrode 0-14pH Bnc Connector Probe Replacement Kit for Aquarium HydroponicspH Electrode 0-14pH Bnc Connector Probe Replacement Kit for Aquarium Hydroponics $17.90 Aqua Medic Refill System Auto Top Off NewAqua Medic Refill System Auto Top Off New $105.00
Lcd Digital Thermometer for Fridge Freezer Water Temperature Aquarium Fish TankLcd Digital Thermometer for Fridge Freezer Water Temperature Aquarium Fish Tank $4.99 to $7.89 2.5 gal Ato aquarium auto top off container tank 2.5 gallon2.5 gal Ato aquarium auto top off container tank 2.5 gallon $78.99
Mw102 Ph & Temperature Meter W/Auto CalcMw102 Ph & Temperature Meter W/Auto Calc $114.00 Trending at $118.00 Avast Top Off Aquarium Water Controller Sensor System Aqua lifterAvast Top Off Aquarium Water Controller Sensor System Aqua lifter $75.00
American Marine Pinpoint Orp Monitor Includes Probe & Calibration FluidsAmerican Marine Pinpoint Orp Monitor Includes Probe & Calibration Fluids $113.99 Lcd Digital Fish Tank Reptile Aquarium Water Marine Thermometer Temperature #UsaLcd Digital Fish Tank Reptile Aquarium Water Marine Thermometer Temperature #Usa $4.99
Milwaukee Instruments Mc720, Mc122 + Mp810 Combo pH Controller + Dosing PumpMilwaukee Instruments Mc720, Mc122 + Mp810 Combo pH Controller + Dosing Pump $215.00 $6.97
Eheim Jager Aquarium Heater Fully Submersible! (Pick Your Size) 25W To 300WEheim Jager Aquarium Heater Fully Submersible! (Pick Your Size) 25W To 300W $22.99 to $29.99 AquaticLife Ph Controller Aquatic LifeAquaticLife Ph Controller Aquatic Life $100.00
New Neptune Systems Apex Controller Wi-FiNew Neptune Systems Apex Controller Wi-Fi $775.00 Inkbird Aquarium Temperature Controller Wifi Thermostat 306A Overheating ProtectInkbird Aquarium Temperature Controller Wifi Thermostat 306A Overheating Protect $36.75 Was:  Previous Price $49.00
New listing
		Neptune Systems Apex Controller base unitNew listing Neptune Systems Apex Controller base unit $100.00 Aqua Reminder Service Alert by Marineland NewAqua Reminder Service Alert by Marineland New $7.25
Neptune Systems Apex Classic AquaController Lab grade Ph probe and temp DisplayNeptune Systems Apex Classic AquaController Lab grade Ph probe and temp Display $226.00 Hanna Instruments Hi758U Marine Calcium Checker Colorimeter (Saltwater)Hanna Instruments Hi758U Marine Calcium Checker Colorimeter (Saltwater) $49.95
Tunze Osmolator Universal 3155 Auto Top OffTunze Osmolator Universal 3155 Auto Top Off $68.00 Auto Water Filler Top off system Aquarium Sytem Water Level Controller FuctionalAuto Water Filler Top off system Aquarium Sytem Water Level Controller Fuctional $8.73
Neptune Systems Apex Classic & More!Neptune Systems Apex Classic & More! $450.00 Dual Optical Auto Top Off Controller - Aquarium Water Ato - IcecapDual Optical Auto Top Off Controller - Aquarium Water Ato - Icecap $124.99
Aquarium Lcd Digital Thermometer Fish Tank Water Digital ThermometerAquarium Lcd Digital Thermometer Fish Tank Water Digital Thermometer $5.80 Digital Salinity Refractometer Meter Water Reader Marine 0~10% Aquarium TesterDigital Salinity Refractometer Meter Water Reader Marine 0~10% Aquarium Tester $14.59
Bubble Magus Dosing Replacement Tubes Only, No Connector (3pcs)Bubble Magus Dosing Replacement Tubes Only, No Connector (3pcs) $16.99 Digital Aquatics Rkm-Pc1 moduleDigital Aquatics Rkm-Pc1 module $22.99
Lcd Digital Thermometer Adhesive Stick On Aquarium Fish Tank Window StripLcd Digital Thermometer Adhesive Stick On Aquarium Fish Tank Window Strip $6.29 Tunze Water Level Osmolator Nano 3152 Automatic Aquarium Water Top Off AtoTunze Water Level Osmolator Nano 3152 Automatic Aquarium Water Top Off Ato $97.46
Magnetic probe holderMagnetic probe holder $25.00 Tiny Seas Digital Aquarium Fish Tank Temperature Thermometer Free Extra BatteryTiny Seas Digital Aquarium Fish Tank Temperature Thermometer Free Extra Battery $4.99
Digital Fish Tank Aquarium Thermometer Water Temperature Meter ?C and ?F LcdDigital Fish Tank Aquarium Thermometer Water Temperature Meter ?C and ?F Lcd $5.89 Was:  Previous Price $6.55 Black Aquarium Temperature Gauge Lcd Digital Thermometer For Fish Tank WaterBlack Aquarium Temperature Gauge Lcd Digital Thermometer For Fish Tank Water $6.99
Ph Probe Bnc Connector Electrode Ph Probe Sensor For Lab Ph Controller MeterPh Probe Bnc Connector Electrode Ph Probe Sensor For Lab Ph Controller Meter $15.00 Ph Controller System - electrode probe Bnc Co2 Regulator Timer tetser 100~240VPh Controller System - electrode probe Bnc Co2 Regulator Timer tetser 100~240V $276.08
Digital Aquatics Sl1 (System Lab 1)Digital Aquatics Sl1 (System Lab 1) $19.50 Digital Aquatics Net ModuleDigital Aquatics Net Module $10.50
Hanna Instruments Hi736 ReagentsHanna Instruments Hi736 Reagents $12.90 Seneye Home Aquarium MonitorSeneye Home Aquarium Monitor $149.00
Led Aquarium Thermometer Electronic Digital Thermometer Fish Tank Thermometer UsLed Aquarium Thermometer Electronic Digital Thermometer Fish Tank Thermometer Us $8.99 Digital Lcd Fish Aquarium Thermometer with Submersible Probe & Battery Us StockDigital Lcd Fish Aquarium Thermometer with Submersible Probe & Battery Us Stock $6.79
Hm Digital Dm-1 In-Line Dual Tds Monitor, 0-9990 ppm Range +/- 2%Hm Digital Dm-1 In-Line Dual Tds Monitor, 0-9990 ppm Range +/- 2% $29.40 Digital Lcd Fish Tank Thermometer Aquarium Probe Water Temperature Monitor UsDigital Lcd Fish Tank Thermometer Aquarium Probe Water Temperature Monitor Us $5.09
Milwaukee- Mc122 Ph Controller With Mounting Kit And Probe Holder Co2 DosingMilwaukee- Mc122 Ph Controller With Mounting Kit And Probe Holder Co2 Dosing $130.00 Auto Top Off Controller - JbjAuto Top Off Controller - Jbj $89.99
Tunze Osmolator Nano 3152 Auto Top Off AtoTunze Osmolator Nano 3152 Auto Top Off Ato $49.00 Marina Floating Thermometer Suction Cup Aquarium Fish Tank Temperature IndicatorMarina Floating Thermometer Suction Cup Aquarium Fish Tank Temperature Indicator $3.45
Icecap Ato - Automatic Top Off Aquarium SystemIcecap Ato - Automatic Top Off Aquarium System $124.99 Neptune Systems Apex Atk Automatic Top-Off Kit Ato Auto CompleteNeptune Systems Apex Atk Automatic Top-Off Kit Ato Auto Complete $199.95
Neptune Systems pH Calibration Fluid /Buffer/Salinity 10:00/7:00/4:00/53000 uSNeptune Systems pH Calibration Fluid /Buffer/Salinity 10:00/7:00/4:00/53000 uS $5.16 to $21.91 Aqua Reminder Marineland Programmable Aquarium Fish Tank Service AlertAqua Reminder Marineland Programmable Aquarium Fish Tank Service Alert $9.99
Refractometer Salinity Meter Salt Aquarium Fish Tank Test Tester Dual Scale ToolRefractometer Salinity Meter Salt Aquarium Fish Tank Test Tester Dual Scale Tool $14.62 Was:  Previous Price $15.39 Aquarium Co2 Diffuser Corner for Fish Tank Water Plants 4/6mm Tubeing SolenoidAquarium Co2 Diffuser Corner for Fish Tank Water Plants 4/6mm Tubeing Solenoid $8.98
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Prices current as of last update, 10/13/19 1:57am.

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