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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Digital Aquatics Reefkeeper Lite (Basic) Controller - Free ShippingDigital Aquatics Reefkeeper Lite (Basic) Controller - Free Shipping $147.99 Lcd Digital Fish Tank Aquarium Marine Water Meter Thermometer Temperature BlackLcd Digital Fish Tank Aquarium Marine Water Meter Thermometer Temperature Black $3.99
pH Calibration Solution Combo: 1 x pH 4.01Buffer Solution 220 ml 1 x pH 7.01BuffpH Calibration Solution Combo: 1 x pH 4.01Buffer Solution 220 ml 1 x pH 7.01Buff $26.95 Milwaukee Mc120 pH Monitor, Set Point 5.5-9.5pHMilwaukee Mc120 pH Monitor, Set Point 5.5-9.5pH $83.95
Milwaukee Ma911B/2 pH Electrode Probe works with Sms120/Sms122/Sms125Milwaukee Ma911B/2 pH Electrode Probe works with Sms120/Sms122/Sms125 $38.95 Vertex Orp Redox ProbeVertex Orp Redox Probe $39.99
Apex Ddr Dosing Container with Optical EyesApex Ddr Dosing Container with Optical Eyes $149.00 Lifegard Aquatics Little Time Or Temp Digital Aquarium Fish Tank ThermometerLifegard Aquatics Little Time Or Temp Digital Aquarium Fish Tank Thermometer $16.98
Fluval 2 Channel Led Lame Timer A3977Fluval 2 Channel Led Lame Timer A3977 $17.85 Used ReefLink Br10 Aquarium Controller - EcoTech Marine Used ReefLink Br10 Aquarium Controller - EcoTech Marine  $40.00
Hde Digital Salt Water Aquarium pH Meter and Lcd Thermometer w Tds Water QualitHde Digital Salt Water Aquarium pH Meter and Lcd Thermometer w Tds Water Qualit $9.41 Awc - Auto Water Changer - Aquarium Ato - AutoaquaAwc - Auto Water Changer - Aquarium Ato - Autoaqua $199.99
Seneye Reef Monitor - Brand New - Free ShippingSeneye Reef Monitor - Brand New - Free Shipping $209.99 New listing
		Neptune systems Apex Awm - Wireless Light Controller for Ai AquaIlluminationNew listing Neptune systems Apex Awm - Wireless Light Controller for Ai AquaIllumination $149.99
Dual Optical Auto Top Off Controller - Aquarium Water Ato - IcecapDual Optical Auto Top Off Controller - Aquarium Water Ato - Icecap $124.99 2 pcs Lcd Digital Fish Aquarium Thermometer Water Terrarium Black Free Batteries2 pcs Lcd Digital Fish Aquarium Thermometer Water Terrarium Black Free Batteries $6.89 Trending at $9.98
Tunze Turbelle NanoStream 6040 Controllable Pump w/ Controller ElectronicTunze Turbelle NanoStream 6040 Controllable Pump w/ Controller Electronic $139.97 Neptune Systems Apex Energy Bar 8 outlets Energybar Surge Protector Neptune Systems Apex Energy Bar 8 outlets Energybar Surge Protector  $99.00
GrowBro Co2 Generator Refill Kit Grow Box Cabinets Bucket Bag Pc HydroponicGrowBro Co2 Generator Refill Kit Grow Box Cabinets Bucket Bag Pc Hydroponic $11.99 ReefKeeper Lite Plus Controller - Digital AquaticsReefKeeper Lite Plus Controller - Digital Aquatics $279.99
Smart Skimmer Security - AutoaquaSmart Skimmer Security - Autoaqua $59.99 Neptune Systems Apex Lunar Simulator Module (Lsm) *Free Usa Express Shipping*Neptune Systems Apex Lunar Simulator Module (Lsm) *Free Usa Express Shipping* $64.95
Fluval Wireless 2in1 Digital ThermometerFluval Wireless 2in1 Digital Thermometer $16.75 Innovative Marine Hydrofill Ti Ato Pump Return Line Bracket/Tube - Rimmed TanksInnovative Marine Hydrofill Ti Ato Pump Return Line Bracket/Tube - Rimmed Tanks $23.00
Aquatek Premium Brass Check ValveAquatek Premium Brass Check Valve $11.99 3 X Lcd Digital Aquarium Fish Tank Thermometer Water Terrarium Free Batteries3 X Lcd Digital Aquarium Fish Tank Thermometer Water Terrarium Free Batteries $8.98
New listing
		Smart Ato Micro Auto Top Off System with Pump - Full System - AutoAquaNew listing Smart Ato Micro Auto Top Off System with Pump - Full System - AutoAqua $100.00 Seawater 35 Ppt Refractometer Salt Calibration Solution - 60 Ml - Aquarium ReefSeawater 35 Ppt Refractometer Salt Calibration Solution - 60 Ml - Aquarium Reef $11.48
Standard Seawater 35 ppt Refractometer Calibrat
00004000
ion Solution - 60 ml, NewStandard Seawater 35 ppt Refractometer Calibrat 00004000 ion Solution - 60 ml, New $12.65 Neptune Systems Apex Os-1 Optical Level Sensor With Magnetic MountNeptune Systems Apex Os-1 Optical Level Sensor With Magnetic Mount $34.95
Tunze Osmolator Universal 3155 Marine Aquarium Auto Top - Off System Water levelTunze Osmolator Universal 3155 Marine Aquarium Auto Top - Off System Water level $179.99 Tunze 5000.020 Replacement Ato Pump For 3155 Osmolator 3152 Nano Auto Top OffTunze 5000.020 Replacement Ato Pump For 3155 Osmolator 3152 Nano Auto Top Off $23.47
Lcd 3D Crystal Digital Electronic Aquarium Thermometer Fish Tank Temp MeterLcd 3D Crystal Digital Electronic Aquarium Thermometer Fish Tank Temp Meter $5.99 Solenoid Magnetic Valve Replacement Ac100-240V for Co2 Regulator Ce A2ASolenoid Magnetic Valve Replacement Ac100-240V for Co2 Regulator Ce A2A $23.19
Icecap Salinity/Temperature Digital Tester Saltwater Aquariums RefractomerIcecap Salinity/Temperature Digital Tester Saltwater Aquariums Refractomer $139.99 Aquatek Premium Co2 Regulator w/ integrated solenoid 140 Psi Max Model R-76-1Aquatek Premium Co2 Regulator w/ integrated solenoid 140 Psi Max Model R-76-1 $39.99
Lifegard Aquatics Big Digital Temp Alert Aquarium ThermometerLifegard Aquatics Big Digital Temp Alert Aquarium Thermometer $18.00 Deep Blue Aquarium Professional Accurate High Performance Suction ThermometerDeep Blue Aquarium Professional Accurate High Performance Suction Thermometer $6.47
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.) $28.41 Fluval 45 g Pressurized Co2 Kit Up to 30 Us Gal, 17554Fluval 45 g Pressurized Co2 Kit Up to 30 Us Gal, 17554 $29.00
Car Mini Thermometer Universal Temperature Gauge Swimming PoolCar Mini Thermometer Universal Temperature Gauge Swimming Pool $3.01 New Tiny Seas Digital Lcd Aquarium Temperature Thermometer Free Extra BatteryNew Tiny Seas Digital Lcd Aquarium Temperature Thermometer Free Extra Battery $4.55
Neptune Apex Aquacontroller 3 with extrasNeptune Apex Aquacontroller 3 with extras $149.99 Lcd Digital Fish Aquarium Thermometer Water Free Extra BatteriesLcd Digital Fish Aquarium Thermometer Water Free Extra Batteries $4.55 to $4.99
Better Than American Marine Pinpoint Ph Monitor Reef FanaticBetter Than American Marine Pinpoint Ph Monitor Reef Fanatic $7.29 Hm Digital Sp-P2 Replacement Ph Sensor for Ph-200Hm Digital Sp-P2 Replacement Ph Sensor for Ph-200 $27.18
3X Aquarium Lcd Digital Fish Thermometer Water Terrarium Black Free Batteries3X Aquarium Lcd Digital Fish Thermometer Water Terrarium Black Free Batteries $7.79 Jebao Jecod Apex Controller To Neptune Systems Linkage Adapter Us warranty pumpJebao Jecod Apex Controller To Neptune Systems Linkage Adapter Us warranty pump $35.99
Pb4 Power Bar for ReefKeeper by Digital AquaticsPb4 Power Bar for ReefKeeper by Digital Aquatics $99.99 Bubble Magus Dosing Replacement Tubes Only, No Connector (3pcs)Bubble Magus Dosing Replacement Tubes Only, No Connector (3pcs) $16.99
Milwaukee Mc122 pH Controller 115V, for Co2 Dosing/Monitor/Tester/Met erMilwaukee Mc122 pH Controller 115V, for Co2 Dosing/Monitor/Tester/Met er $125.95 0~100% Salt Sea Refractometer Salinity Tester For Water Marine Aquarium0~100% Salt Sea Refractometer Salinity Tester For Water Marine Aquarium $19.99 Trending at $20.99
Seneye Home Aquarium Monitor - Brand New - Free ShippingSeneye Home Aquarium Monitor - Brand New - Free Shipping $148.99 Tunze Osmolator Universal Ato 3155 - Aquarium Water Refill System Auto Top OffTunze Osmolator Universal Ato 3155 - Aquarium Water Refill System Auto Top Off $189.99
Neptune Systems - Apex Jr Controller Neptune Systems - Apex Jr Controller  $143.00 Brightwell Refractometer Calibration Solution 60 ml Fast Free Usa ShippingBrightwell Refractometer Calibration Solution 60 ml Fast Free Usa Shipping $9.27
Icecap Gyre (Gen 1) Xf130 (Gen 2) Xf230 Interface Module For Neptune Apex SystemIcecap Gyre (Gen 1) Xf130 (Gen 2) Xf230 Interface Module For Neptune Apex System $46.00 American Marine Pinpoint pH Monitor + Probe and Calibration FluidAmerican Marine Pinpoint pH Monitor + Probe and Calibration Fluid $44.00
Waterproof Aquarium Lcd Digital Submersible Thermometer Fish Tank Pet SuppliesWaterproof Aquarium Lcd Digital Submersible Thermometer Fish Tank Pet Supplies $6.37 Lcd Digital Fish Aquarium Thermometer Water Terrarium Black Free Extra BatteriesLcd Digital Fish Aquarium Thermometer Water Terrarium Black Free Extra Batteries $4.97
Lifegard Aquatics Big Temp-Alert Digital Aquarium Thermometer Free Usa Shipping!Lifegard Aquatics Big Temp-Alert Digital Aquarium Thermometer Free Usa Shipping! $32.95 Was:  Previous Price $41.19 Coralife Deep Six Hydrometer Salinity Test Specific Gravity Meter Free Usa ShipCoralife Deep Six Hydrometer Salinity Test Specific Gravity Meter Free Usa Ship $11.95 Was:  Previous Price $15.93
Smart Ato Automatic Top Off SystemSmart Ato Automatic Top Off System $88.00 New listing
		Jbj Auto Top Off (Ato) and Aqua Lifter, Aqualifter Pump by Tom's Aquatics Aw-20New listing Jbj Auto Top Off (Ato) and Aqua Lifter, Aqualifter Pump by Tom's Aquatics Aw-20 $39.99
Auto Lcd Digital Mini Aquarium Fish Food Feeder Feeding Time Timer for Fish TankAuto Lcd Digital Mini Aquarium Fish Food Feeder Feeding Time Timer for Fish Tank $5.49 to $14.99 AutoAqua Micro Smart Aquarium Ato Automatic Top Off System W/ Pump, EvaporationAutoAqua Micro Smart Aquarium Ato Automatic Top Off System W/ Pump, Evaporation $134.99 Trending at $149.99
ReefKeeper Lite Controller with Temperature Probe - Digital AquaticsReefKeeper Lite Controller with Temperature Probe - Digital Aquatics $134.99 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
Reef Keeper Elite New Head Unit 2X Ph Probes 1X Temp 4X Pc4'A Slx, Hub, AlcReef Keeper Elite New Head Unit 2X Ph Probes 1X Temp 4X Pc4'A Slx, Hub, Alc $349.99 Seneye Reef Aquarium Monitor and Par MeterSeneye Reef Aquarium Monitor and Par Meter $91.00
Lcd Digital Thermometer with Probe Aquarium Water Black Free Extra BatteriesLcd Digital Thermometer with Probe Aquarium Water Black Free Extra Batteries $4.88 AutoTopoff Double Aqualifter Package w Holder, Tubing Aquarium Auto Top Off AtoAutoTopoff Double Aqualifter Package w Holder, Tubing Aquarium Auto Top Off Ato $79.99
New listing
		Neptune Apex Jr Controller with power bar and temperature sensorNew listing Neptune Apex Jr Controller with power bar and temperature sensor $199.99 Deluxe Aquatek Co2 Brass Bubble Counter with Integrated Check ValveDeluxe Aquatek Co2 Brass Bubble Counter with Integrated Check Valve $16.99
reefkeeper controllerreefkeeper controller $100.00 Co2 Atomizer System Aquarium Diffuser 16/22mm Hose new design Plants TankCo2 Atomizer System Aquarium Diffuser 16/22mm Hose new design Plants Tank $23.19
Hanna Instruments Replacement Hi 772-26 Reagent For Alkalinity ColorimeterHanna Instruments Replacement Hi 772-26 Reagent For Alkalinity Colorimeter $14.99 Up Co2 Adjuster pierce Only for disposable 88g 95g co2 cartridge tank RegulatorUp Co2 Adjuster pierce Only for disposable 88g 95g co2 cartridge tank Regulator $19.99
Aquarium Temperature Controller for Heater/Cooling Fans (Plug And Play)Aquarium Temperature Controller for Heater/Cooling Fans (Plug And Play) $59.00 Neptune Systems Apex Jr Aquacontroller - Base Unit | Display | Temperature ProbeNeptune Systems Apex Jr Aquacontroller - Base Unit | Display | Temperature Probe $239.99
Neptune Systems Apex Magnetic Probe Rack Mpr Electrode HolderNeptune Systems Apex Magnetic Probe Rack Mpr Electrode Holder $17.99 Aquarium Glass Thermometer Magnetic Back/Magnet Mounted Jw Smart Temp 5.5"LAquarium Glass Thermometer Magnetic Back/Magnet Mounted Jw Smart Temp 5.5"L $6.97
Neptune Systems AquaController Apex - Standard Grade Orp ProbeNeptune Systems AquaController Apex - Standard Grade Orp Probe $48.47 Grow Bro Co2 Generator Refill Kit For Planted Aquariums organic bio co2Grow Bro Co2 Generator Refill Kit For Planted Aquariums organic bio co2 $11.99
New listing
		Neptune Apex WiFi System Very slightly used. (only had for 1 month)New listing Neptune Apex WiFi System Very slightly used. (only had for 1 month) $1,000.00 Neptune Systems Apex I/O Breakout Box - Authorized Usa Neptune Systems DealerNeptune Systems Apex I/O Breakout Box - Authorized Usa Neptune Systems Dealer $39.95
American Marine Pinpoint Ph Controller - Aquarium Water Tester MeterAmerican Marine Pinpoint Ph Controller - Aquarium Water Tester Meter $188.99 Aquatek SplitPro Co2 Splitter for Solenoid Regulator (3 Way)Aquatek SplitPro Co2 Splitter for Solenoid Regulator (3 Way) $43.99
Innovative Marine HydroFill Ti – Ato Controller Aquarium Automatic Top Off 7503Innovative Marine HydroFill Ti – Ato Controller Aquarium Automatic Top Off 7503 See details... $70.00 New Fish Tank Aquarium Thermometer Temperature °F Fahrenheit Sticker Stick-OnNew Fish Tank Aquarium Thermometer Temperature °F Fahrenheit Sticker Stick-On $1.32 Was:  Previous Price $1.39
Dm-1 Inline Dual Tds Monitor Online Ro Di Water Filter ppm Meter 1/4" Hm DigitalDm-1 Inline Dual Tds Monitor Online Ro Di Water Filter ppm Meter 1/4" Hm Digital $23.99 Innovative Marine - Hydrofill Ti - Ato Return Pump - Auqa GadgetInnovative Marine - Hydrofill Ti - Ato Return Pump - Auqa Gadget $69.99
Aquarium Float Switch - Reef Tank -Da Reef KeeperAquarium Float Switch - Reef Tank -Da Reef Keeper $5.95 6x Fish Aquarium Lcd Digital Thermometer Water Terrarium Black Free Batteries6x Fish Aquarium Lcd Digital Thermometer Water Terrarium Black Free Batteries $13.89
LiterMeter Iii Precision Dosing System - Free Tube Kit Magnet Tube HolderLiterMeter Iii Precision Dosing System - Free Tube Kit Magnet Tube Holder $125.00 New listing
		Neptune Apex eb8New listing Neptune Apex eb8 $20.00
Ghl ProfiLux 4 Aquarium Controller; Ph, salinity, Light, Heater/temp controllerGhl ProfiLux 4 Aquarium Controller; Ph, salinity, Light, Heater/temp controller $849.90 10pcs Fish Aquarium Lcd Digital Thermometer Black Free Batteries Water Terrarium10pcs Fish Aquarium Lcd Digital Thermometer Black Free Batteries Water Terrarium $21.89
New listing
		Digital Ph Controller Ph-201 Meter 110V or 220V Professional No ElectrodeNew listing Digital Ph Controller Ph-201 Meter 110V or 220V Professional No Electrode $62.99 Was:  Previous Price $69.99 Zilla 24/7 Digital Timer Power Center 11893, 1875-Watt, New, Free ShippingZilla 24/7 Digital Timer Power Center 11893, 1875-Watt, New, Free Shipping $27.76 List price:  Previous Price $39.14
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Prices current as of last update, 03/21/18 4:36pm.

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