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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New! Hydor Smart Level Control Water Sensor Level for Aquariums & SumpsNew! Hydor Smart Level Control Water Sensor Level for Aquariums & Sumps $77.99 Tunze Osmolator Universal 3155 Aquarium Auto Top Off System - 3155Tunze Osmolator Universal 3155 Aquarium Auto Top Off System - 3155 $229.99
Jebao New Controller Cradle / Wall Mount - 3D Printed - Many ColorsJebao New Controller Cradle / Wall Mount - 3D Printed - Many Colors $10.00 Salinity Refractometer Meter Water Reader Marine 0~10% Salt Aquarium Test TesterSalinity Refractometer Meter Water Reader Marine 0~10% Salt Aquarium Test Tester $19.99
Orp Probe by PinpointOrp Probe by Pinpoint $69.95 Trident Water Analysis Automated Testing Alkalinity Calcium Magnesium NeptuneTrident Water Analysis Automated Testing Alkalinity Calcium Magnesium Neptune $776.46
New listing
		Bubble Magus Dosing Pump Bracket for Model T01 and T02New listing Bubble Magus Dosing Pump Bracket for Model T01 and T02 $35.00 Magnetic 4 Probe Holder 3 Standard 1 Enlarged for Apex Neptune Temperature ProbeMagnetic 4 Probe Holder 3 Standard 1 Enlarged for Apex Neptune Temperature Probe $27.99
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 Hydrometer Aquarium Saltwater Reef Salt Water Specific Gravity SalinityHydrometer Aquarium Saltwater Reef Salt Water Specific Gravity Salinity $38.00
GrowBro Co2 Generator Refill Kit Grow Box Cabinets Bucket Bag Pc HydroponicGrowBro Co2 Generator Refill Kit Grow Box Cabinets Bucket Bag Pc Hydroponic $15.99 Co2 Working Pressure Adjustable Solenoid Regulator - Diffuser Atomizer Fish TankCo2 Working Pressure Adjustable Solenoid Regulator - Diffuser Atomizer Fish Tank $113.11
Hanna InstrumentsPhosphorus Ultra Low Range Colorimeter Hi736 Hanna Checker -Hanna InstrumentsPhosphorus Ultra Low Range Colorimeter Hi736 Hanna Checker - $21.50 Mw600 Dissolved Oxygen Meter - Milwaukee InstrumentsMw600 Dissolved Oxygen Meter - Milwaukee Instruments $208.00
New listing
		Marine James Bliss Lucite Thermometer & Hygrometer  9.5" X 4" from the 70'sNew listing Marine James Bliss Lucite Thermometer & Hygrometer  9.5" X 4" from the 70's $10.00 Seneye+ 3 Month Replacement Slide Pack - Seneye Reef AquariumSeneye+ 3 Month Replacement Slide Pack - Seneye Reef Aquarium $36.99 Trending at $72.98
Milwaukee Instruments Ph56 Waterproof pH Temp Tester Meter, Martini, Ph52 Ph53Milwaukee Instruments Ph56 Waterproof pH Temp Tester Meter, Martini, Ph52 Ph53 $80.00 Hanna Checker Marine Alkalinity Hi755Hanna Checker Marine Alkalinity Hi755 $49.95
Neptune Lunar Simulator Leds (2)Neptune Lunar Simulator Leds (2) $32.99 Hanna Hi772 Marine Dkh Alkalinity Checker Hc Alk - Hanna InstrumentsHanna Hi772 Marine Dkh Alkalinity Checker Hc Alk - Hanna Instruments $47.55
Jbj Auto Top Off Controller AtoJbj Auto Top Off Controller Ato $35.50 New listing
		Auto Water Filler Power Free Water Level Controller No Spill Auto-top-OffNew listing Auto Water Filler Power Free Water Level Controller No Spill Auto-top-Off $35.09
Milwaukee Mc122 pH Controller w/probeMilwaukee Mc122 pH Controller w/probe $125.95 Trending at $130.00 Neptune Systems Apex Wxm Ecotech Marine Wireless Expansion ModuleNeptune Systems Apex Wxm Ecotech Marine Wireless Expansion Module $149.90
Aquaneat Aquarium Thermometer Digital Fish Tank Terrarium Water Temperature TestAquaneat Aquarium Thermometer Digital Fish Tank Terrarium Water Temperature Test $5.95 Aqua Controller Jr Controller OnlyAqua Controller Jr Controller Only $59.00
Seneye Reef MonitorSeneye Reef Monitor $199.00 Hanna Instruments Hi758U Marine Calcium Checker Colorimeter (Saltwater)Hanna Instruments Hi758U Marine Calcium Checker Colorimeter (Saltwater) $49.95
Coralvue Hydros Control4 0-10v Breakout BoxCoralvue Hydros Control4 0-10v Breakout Box $34.99 Milwaukee Instruments Sea Water Digital Refractometer Water Tester Ma887Milwaukee Instruments Sea Water Digital Refractometer Water Tester Ma887 $114.00 List price:  Previous Price $139.99
Milwaukee Instruments Ma911B/2 pH Probe, for Sms120 Sms122 Sms125 Mc120 Mc122Milwaukee Instruments Ma911B/2 pH Probe, for Sms120 Sms122 Sms125 Mc120 Mc122 $38.00 Trending at $38.99 MarinePure Biofilter 1.5" Spheres (2 Quart) - CermediaMarinePure Biofilter 1.5" Spheres (2 Quart) - Cermedia $28.89 Trending at $31.45
Weipro Ph2010A Ph meter and controller (New, Open Box)Weipro Ph2010A Ph meter and controller (New, Open Box) $78.99 Milwaukee Instruments Mc720, Mc122 + Mp810 Combo pH Controller + Dosing PumpMilwaukee Instruments Mc720, Mc122 + Mp810 Combo pH Controller + Dosing Pump $215.00
Neptune SystemsAtk V2 Auto Top Off KitNeptune SystemsAtk V2 Auto Top Off Kit $145.25 Water level Osmolator Nano 3152 Automatic Aquarium Water Top-Off, TunzeWater level Osmolator Nano 3152 Automatic Aquarium Water Top-Off, Tunze $115.00
Jbj Truetemp - Aquarium Heater Replacement Temperature Probe And WireJbj Truetemp - Aquarium Heater Replacement Temperature Probe And Wire $24.75 Neptune Apex Trident Reagent Needle Guide & Tube Organizer Deal - 3 Each - DealNeptune Apex Trident Reagent Needle Guide & Tube Organizer Deal - 3 Each - Deal $29.99
Lab Orp ProbeLab Orp Probe $40.00 Neptune Systems AquaControllerNeptune Systems AquaController $35.00
Hanna Checker Nitrite Ultra Low Range Hi 764Hanna Checker Nitrite Ultra Low Range Hi 764 $49.95 New Apex Adm Silver Display - Neptune Systems - AquariumsNew Apex Adm Silver Display - Neptune Systems - Aquariums $139.99
Us Aquarium Ato Auto Top Off System Smart Water Level Filler Pump Dual SensorsUs Aquarium Ato Auto Top Off System Smart Water Level Filler Pump Dual Sensors $66.99 American Marine Pinpoint pH MonitorAmerican Marine Pinpoint pH Monitor $60.00
Jw Pet Fusion Smart Temp | Non-Standing Magnet Style | Aquarium ThermometerJw Pet Fusion Smart Temp | Non-Standing Magnet Style | Aquarium Thermometer $6.99 List price:  Previous Price $7.24 Coralvue Hydros Control4 Button Switch BoxCoralvue Hydros Control4 Button Switch Box $59.99 to $64.99
New listing
		Aquarium Thermometer, Digital Touch Screen Fish Tank Thermometer With blackNew listing Aquarium Thermometer, Digital Touch Screen Fish Tank Thermometer With black $27.18 Seneye Web Server (Non Wifi) - SeneyeSeneye Web Server (Non Wifi) - Seneye $199.00
IceCap Salinity and Temperature Digital Pocket Tester For AquariumsIceCap Salinity and Temperature Digital Pocket Tester For Aquariums $69.99 Neptune Systems Energy Bar 8Neptune Systems Energy Bar 8 $51.00
Professional Digital pH Orp Controller Nib And Pinpoint Orp Electrode PreownedProfessional Digital pH Orp Controller Nib And Pinpoint Orp Electrode Preowned $50.00 American Marine Pinpoint Orp Monitor with probe and calibration fluidAmerican Marine Pinpoint Orp Monitor with probe and calibration fluid $114.99
ApexEl Controller - Neptune Apex Controller Wifi Model - Entry LevelApexEl Controller - Neptune Apex Controller Wifi Model - Entry Level $499.95 Neptune Systems Apex Breakout Box Free Shipping SaleNeptune Systems Apex Breakout Box Free Shipping Sale $29.00
Milwaukee Instruments 716690 ph ControllerMilwaukee Instruments 716690 ph Controller $177.72 AutoTopoff Double - Water Level Controller for Reef Aquarium - Auto Top Off AtoAutoTopoff Double - Water Level Controller for Reef Aquarium - Auto Top Off Ato $50.00
Neptune solenoid valveNeptune solenoid valve $10.00 Neptune 2” Flow Sensor Fs-200Neptune 2” Flow Sensor Fs-200 $85.00
New Digital Lcd Fish Tank Aquarium Marine Water Thermometer Temperature BlackNew Digital Lcd Fish Tank Aquarium Marine Water Thermometer Temperature Black $5.95 Neptune System Apex Eb4Neptune System Apex Eb4 $119.00
Zoo Med Repticare® Day & Night TimerZoo Med Repticare® Day & Night Timer $13.99 Bulk Reef Supply Aquatium RefractometerBulk Reef Supply Aquatium Refractometer $15.00
Customizable Apex Neptune Breakout Box w/ Orange Toggle Switch See DescriptionCustomizable Apex Neptune Breakout Box w/ Orange Toggle Switch See Description $49.49 Was:  Previous Price $54.99 Dual Optical Auto Top Off Controller - Aquarium Water Ato - IcecapDual Optical Auto Top Off Controller - Aquarium Water Ato - Icecap $12 00006000 6.99
New listing
		Aquarium Thermometer, Digital Touch Screen Fish Tank Thermometer With Large LcdNew listing Aquarium Thermometer, Digital Touch Screen Fish Tank Thermometer With Large Lcd $22.28 Tunze Osmolator Nano 3152 Auto Top Off AtoTunze Osmolator Nano 3152 Auto Top Off Ato $101.59
2pcs Mount for Apex 24v Solenoid2pcs Mount for Apex 24v Solenoid $14.99 New listing
		Xp Aqua Duetto Dual-Sensor Complete Aquarium Auto-Top-Off Ato SystemNew listing Xp Aqua Duetto Dual-Sensor Complete Aquarium Auto-Top-Off Ato System $1.00
Tunze Water Level Osmolator Nano 3152 Automatic Aquarium Water Top Off AtoTunze Water Level Osmolator Nano 3152 Automatic Aquarium Water Top Off Ato $139.99 Milwaukee Mc122 pH Controller 115V.Milwaukee Mc122 pH Controller 115V. $110.00
Reef Fanatic Ph Controller w/probeReef Fanatic Ph Controller w/probe $154.99 Customizable Apex Neptune Breakout Box 4 switches 2 push release connectorsCustomizable Apex Neptune Breakout Box 4 switches 2 push release connectors $35.99 Was:  Previous Price $39.99
Koralia Smart Wave Pump Controller - HydorKoralia Smart Wave Pump Controller - Hydor $69.95 Aquarium Solutions Accuprobe Hydrometer Free ShippingAquarium Solutions Accuprobe Hydrometer Free Shipping $12.95
Xp Aqua Duetto Dual-Sensor Complete Aquarium Auto Top Off AtoXp Aqua Duetto Dual-Sensor Complete Aquarium Auto Top Off Ato $129.00 *Neptune Systems Apex Ldk Leak Detector with 3 Sensors and Aquabus*Neptune Systems Apex Ldk Leak Detector with 3 Sensors and Aquabus $94.00
Neptune Apex Eb4 Energy Bar - Neptune SystemsNeptune Apex Eb4 Energy Bar - Neptune Systems $47.00 Icecap Salinity/Temperature Digital Tester Saltwater Aquariums Refractomer NewIcecap Salinity/Temperature Digital Tester Saltwater Aquariums Refractomer New $69.99
Milwaukee Mc125 Orp/Ph Dual Controller, 2 Probes Included, Sms125, MeterMilwaukee Mc125 Orp/Ph Dual Controller, 2 Probes Included, Sms125, Meter $203.00 Neptune systems TridentNeptune systems Trident $2,399.99
Milwaukee Mc510 Orp/Mv Controller, Probe Included, 115V, Sms510/Monitor/MeterMilwaukee Mc510 Orp/Mv Controller, Probe Included, 115V, Sms510/Monitor/Meter $136.00 Breakout Box Plus For Neptune Apex controller (Black)Breakout Box Plus For Neptune Apex controller (Black) $34.99
Customizable 4x switch Apex Neptune breakout box with 24Vdc alarm.Customizable 4x switch Apex Neptune breakout box with 24Vdc alarm. $79.99 Was:  Previous Price $89.99 Neptune Apex Breakout Box w/ Push Terminals custom 2 switch panel choose from 3Neptune Apex Breakout Box w/ Push Terminals custom 2 switch panel choose from 3 $31.49 Was:  Previous Price $34.99
Mc122 Ph Controller w/ Ph Electrode - Milwaukee InstrumentsMc122 Ph Controller w/ Ph Electrode - Milwaukee Instruments $130.00 Inkbird Wifi Temperature Controller Wireless Thermostat 306A Overheating ProtectInkbird Wifi Temperature Controller Wireless Thermostat 306A Overheating Protect $41.65 Was:  Previous Price $49.00
Neptune Apex Breakout Box Dc Jacks w/ 6 cable leads included Hidden MountingNeptune Apex Breakout Box Dc Jacks w/ 6 cable leads included Hidden Mounting $32.39 Was:  Previous Price $35.99 Aquaneat Aquarium Thermometer Digital Fish Tank Temperature yellow 3PcsAquaneat Aquarium Thermometer Digital Fish Tank Temperature yellow 3Pcs $9.62 Was:  Previous Price $10.69
1 Aquarium Fish Tank Thermometer Temp Sticker Stick on *Fahrenheit In Bold!*1 Aquarium Fish Tank Thermometer Temp Sticker Stick on *Fahrenheit In Bold!* $1.95 Neptune Apex Trident Brand New & Sealed Box Free Fast ShippingNeptune Apex Trident Brand New & Sealed Box Free Fast Shipping $629.00
Brand New Ghl Profilux Plus Ii Aquarium ControllerBrand New Ghl Profilux Plus Ii Aquarium Controller $100.00 New listing
		Brs Refractometer Check salinity NewNew listing Brs Refractometer Check salinity New $22.00
Aquaneat Aquarium Thermometer Digital Fish Tank Temperature 3PcsAquaneat Aquarium Thermometer Digital Fish Tank Temperature 3Pcs $10.99 Gx12-6 Cable for Coralvue Hydros Control4 0-10v Input DiyGx12-6 Cable for Coralvue Hydros Control4 0-10v Input Diy $13.99
Brightwell Refractometer Calibration Solution 60mL Fast Free Usa ShippingBrightwell Refractometer Calibration Solution 60mL Fast Free Usa Shipping $7.99 Milwaukee Digitial Seawater Salinity RefractometerMilwaukee Digitial Seawater Salinity Refractometer $114.00
Reefkeeper Net ModuleReefkeeper Net Module $25.00 Hi721-25 Iron Checker Hc Reagents (25 Tests)Hi721-25 Iron Checker Hc Reagents (25 Tests) $11.99
Osmolator Nano 3152 Auto Top Off - TunzeOsmolator Nano 3152 Auto Top Off - Tunze $99.99 Aquarium Digital Thermometer Fish Tank Salt Water Terrarium with Extra BatteryAquarium Digital Thermometer Fish Tank Salt Water Terrarium with Extra Battery $5.65 to $17.00 Was:  Previous Price $5.95
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Prices current as of last update, 04/15/21 5:57am.

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