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Summer Sale! Use code SUMMER26 for 15% off · Free shipping on orders $49+
Summer Sale! Use code SUMMER26 for 15% off our summer collection! Free shipping on orders $49+
Fish aquarium water testing kits and clarifiers for maintaining healthy tank conditions and clear water

Fish — Decor & Care — Water Testing & Clarifiers

Keep your aquarium water crystal clear and perfectly balanced with our water testing and clarifiers collection. These essential tools help you monitor pH levels, ammonia, and other crucial water parameters to ensure your fish stay healthy and happy.

From easy-to-use test strips to powerful water clarifiers that eliminate cloudiness, our products make aquarium maintenance simple and stress-free. Regular testing and treatment create the ideal environment where your aquatic friends can thrive and showcase their natural beauty.

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CO2 drop checker kit with glass checker, indicator solution bottle, and dropper on white background
CO2 indicator solution bottle with green cap, glass drop checker, and pipette on white background Sale Sale

Nano Glass CO2 Drop Checker Kit

$73.35
$73.35 - $73.35
$73.35
$32.95
$32.95 - $32.95
$32.95
in stock

Why you'll love itMonitor your planted aquarium's CO2 levels with precision using this complete glass drop checker system. The color-changing indic...

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$73.35
$73.35 - $73.35
$73.35
$32.95
$32.95 - $32.95
$32.95
Sale Sale
CO2 drop checker kit with reagent bottle, glass checker with green solution, and suction cup
CO2 drop checker kit with green indicator solution bottle and clear glass checker components

Precision Glass CO2 Drop Checker

$86.98 - $86.98
$86.98
$86.98
$86.98 - $86.98
$86.98
in stock

Why you'll love itGet accurate CO2 monitoring for your planted aquarium with this professional glass drop checker kit. No more guessing about your ...

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$86.98 - $86.98
$86.98
$86.98
$86.98 - $86.98
$86.98
Aquarium test kit bottle with colorful water parameter chart and test strips displayed
10-in-1 aquarium test kit box with colorful test strips and color chart showing water parameters Sale Sale

10-in-1 Aquarium Water Test Strips Kit

$125.91
$125.91 - $125.91
$125.91
$55.95
$55.95 - $55.95
$55.95
in stock

Why you'll love itKeep your fish healthy and your aquarium thriving with this comprehensive water testing solution that checks 10 essential paramet...

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$125.91
$125.91 - $125.91
$125.91
$55.95
$55.95 - $55.95
$55.95
Sale Sale
Orange and white ammonia test strips bottle with color chart showing measurement levels 0-10 mg/L
Orange and white ammonia test strips package with bottle showing color chart for aquarium testing Sale Sale

AAwipes Aquarium Ammonia Test Strips Kit

$99.04
$99.04 - $99.04
$99.04
$43.95
$43.95 - $43.95
$43.95
in stock

Why you'll love itKeep your fish healthy and stress-free with precise ammonia monitoring that prevents dangerous spikes before they threaten your a...

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$99.04
$99.04 - $99.04
$99.04
$43.95
$43.95 - $43.95
$43.95
Sale Sale
Fluval phosphate test kit box showing PO4 testing range and tropical fish imagery
Fluval phosphate test kit box showing PO4 testing range and tropical fish imagery on blue packaging
Sale Sale

Fluval Phosphate Test Kit for Aquariums

$99.07
$99.07 - $99.07
$99.07
$43.95
$43.95 - $43.95
$43.95
in stock

Why you'll love itKeep your aquarium healthy with precise phosphate testing that prevents harmful algae growth and supports coral development. Keep...

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$99.07
$99.07 - $99.07
$99.07
$43.95
$43.95 - $43.95
$43.95
Sale Sale
7-in-1 Aquarium Water Test Strips
Aquarium test strips bottle with color chart and blue packaging box showing 100 strips
Sale Sale

7-in-1 Aquarium Water Test Strips

$58.66
$58.66 - $58.66
$58.66
$26.95
$26.95 - $26.95
$26.95
in stock

Why you'll love itKeep your fish healthy with these comprehensive water test strips that check 7 vital parameters in just 60 seconds. Keep reading ...

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$58.66
$58.66 - $58.66
$58.66
$26.95
$26.95 - $26.95
$26.95
Sale Sale
Fluval ammonia test kit box showing colorful tropical fish and product details on blue packaging
Fluval ammonia test kit box showing NH3/NH4 testing for aquarium water quality with fish imagery
Sale Sale

Fluval Phosphate Test Kit for Aquariums

$69.68
$69.68 - $69.68
$69.68
$31.95
$31.95 - $31.95
$31.95
in stock

Why you'll love itKeep your fish healthy and your tank thriving with accurate phosphate testing. This professional-grade test kit helps prevent alg...

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$69.68
$69.68 - $69.68
$69.68
$31.95
$31.95 - $31.95
$31.95
Sale Sale
Professional Aquarium Phosphate Test Strips
ADVATEC phosphate test strips bottle and box with white test strip and water splash effect
Sale Sale

Professional Aquarium Phosphate Test Strips

$99.07
$99.07 - $99.07
$99.07
$43.95
$43.95 - $43.95
$43.95
in stock

Why you'll love itKeep your fish healthy and your aquarium crystal clear with lab-grade phosphate testing that delivers results in just 90 seconds....

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$99.07
$99.07 - $99.07
$99.07
$43.95
$43.95 - $43.95
$43.95
Sale Sale
Hands holding bottle of 7-in-1 aquarium test strips with colorful test strips visible nearby
Hands holding aquarium test strip bottle with colorful test strips showing 7-in-1 water testing
Sale Sale

Professional 7-in-1 Aquarium Water Test Strips

$48.39
$48.39 - $48.39
$48.39
$21.95
$21.95 - $21.95
$21.95
in stock

Why you'll love itKeep your fish happy and healthy with instant water quality testing. These comprehensive test strips check seven critical paramet...

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$48.39
$48.39 - $48.39
$48.39
$21.95
$21.95 - $21.95
$21.95
Sale Sale
6-in-1 Aquarium Water Test Strips Kit
EASYTEST aquarium test strips box and bottle with color chart showing 6-in-1 water testing kit
Sale Sale

6-in-1 Aquarium Water Test Strips Kit

$73.35
$73.35 - $73.35
$73.35
$32.95
$32.95 - $32.95
$32.95
in stock

Why you'll love itKeep your fish healthy and your aquarium thriving with this comprehensive water testing solution that monitors six critical param...

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$73.35
$73.35 - $73.35
$73.35
$32.95
$32.95 - $32.95
$32.95
Sale Sale
Two packages of Tetra EasyStrips 6-in-1 aquarium test strips showing blue and yellow packaging
Two packages of Tetra EasyStrips 6-in-1 aquarium test strips showing blue and yellow packaging
Sale Sale

Tetra EasyStrips 6-in-1 Aquarium Test Strips

$99.07
$99.07 - $99.07
$99.07
$43.95
$43.95 - $43.95
$43.95
in stock

Why you'll love itKeep your fish healthy with accurate water testing that takes just 60 seconds. These professional-grade test strips check six cri...

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$99.07
$99.07 - $99.07
$99.07
$43.95
$43.95 - $43.95
$43.95
Sale Sale
AquaApex aquarium test strips kit showing colorful parameter chart and testing strips inside box
AquaApex 10-in-1 aquarium test strips kit box with colorful parameter chart and 150 strips
Sale Sale

Professional 10-in-1 Aquarium Water Test Kit

$110.09
$110.09 - $110.09
$110.09
$48.95
$48.95 - $48.95
$48.95
in stock

Why you'll love itKeep your fish healthy with professional-grade water testing that catches problems before they start. This comprehensive kit test...

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$110.09
$110.09 - $110.09
$110.09
$48.95
$48.95 - $48.95
$48.95
Sale Sale
Open aquarium water test kit showing bottles, syringes and testing supplies with Made in Germany tag
Open aquarium water test kit case showing colorful reagent bottles and testing supplies
Sale Sale

Complete 9-Parameter Aquarium Water Test Kit

$334.32
$334.32 - $334.32
$334.32
$146.95
$146.95 - $146.95
$146.95
in stock

Why you'll love itMaintaining a healthy aquarium just got easier with this comprehensive test kit that monitors nine critical water parameters. Per...

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$334.32
$334.32 - $334.32
$334.32
$146.95
$146.95 - $146.95
$146.95
Sale Sale
White and green digital pH meter with LCD display showing readings next to calibration solution
White and green digital pH meter with LCD display showing 35.0 ppt and calibration solution bottles
Sale Sale

Digital Aquarium pH & Salt Tester

$132.95
$132.95 - $132.95
$132.95
$58.95
$58.95 - $58.95
$58.95
in stock

Why you'll love itGetting your aquarium water chemistry just right can make or break your fish's health. This 5-in-1 digital tester takes the guess...

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$132.95
$132.95 - $132.95
$132.95
$58.95
$58.95 - $58.95
$58.95
Sale Sale
Microbe-Lift TheraP fish care bottle with orange-red liquid and reef safe certification badge
Microbe-Lift TheraP fish care treatment bottle with red liquid and colorful aquatic label design

TheraP Advanced Fish Health Treatment 16oz

$37.95 - $37.95
$37.95
$37.95 - $37.95
$37.95
in stock

Why you'll love itYour fish deserve the best care, and this professional-grade treatment delivers results for both freshwater and saltwater aquariu...

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$37.95 - $37.95
$37.95
$37.95 - $37.95
$37.95
Premium 3-Pack Aquarium Water Clarifier
ALGONE water clarifier product box showing blue packaging with fish image and filter pouches
Sale Sale

Premium 3-Pack Aquarium Water Clarifier

$141.46
$141.46 - $141.46
$141.46
$62.95
$62.95 - $62.95
$62.95
in stock

Why you'll love itKeep your aquarium crystal clear and your fish thriving with this powerful 3-pack water treatment system. This professional-grade...

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$141.46
$141.46 - $141.46
$141.46
$62.95
$62.95 - $62.95
$62.95
Sale Sale

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