What water treatment do I need for a freshwater aquarium?

Most freshwater aquariums need a water conditioner to remove chlorine and chloramines from tap water. Depending on your tank's needs, you may also require pH balancers, ammonia removers, and bacteria supplements to keep water parameters stable and fish healthy.

Do I need a special water conditioner for freshwater tanks?

Yes, freshwater aquariums need water conditioners formulated specifically for their environment. These treatments neutralize harmful chemicals in tap water and support a safe, stress-free habitat for your fish.

Tropical Fish Tank Health & Water Care - Page 5 (Free Shipping)

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Tetra SafeStart Plus for Freshwater Aquariums, 8.45-fl oz bottle slide 2 of 8

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Tetra SafeStart Plus for Freshwater Aquariums, 8.45-fl oz bottle

Rated 4.9 out of 5 stars

11

$18.07 Chewy Price

($2.14/fl oz) Price per Unit

$22.89 List Price

Autoship Price

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

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Hydrospace PNS ProBio Fish Aquarium Additive, Maroon, 16-fl oz slide 2 of 4

Hydrospace PNS ProBio Fish Aquarium Additive, Maroon, 16-fl oz slide 3 of 4

Hydrospace PNS ProBio Fish Aquarium Additive, Maroon, 16-fl oz slide 4 of 4

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Hydrospace PNS ProBio Fish Aquarium Additive, Maroon, 16-fl oz

Rated 5 out of 5 stars

1

$30.99 Chewy Price

($1.94/oz) Price per Unit

Autoship Price

Contains Live Feed

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

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ASF SeaTest Mg2+ Magnesium Fish Aquarium Water Test Kit, 40 count slide 2 of 3

ASF SeaTest Mg2+ Magnesium Fish Aquarium Water Test Kit, 40 count slide 3 of 3

ASF SeaTest Mg2+ Magnesium Fish Aquarium Water Test Kit, 40 count

$26.99 Chewy Price

($0.68/ea) Price per Unit

$31.99 List Price

Autoship Price

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

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Aqueon Freshwater Clarifier, 8-fl oz bottle slide 2 of 8

Aqueon Freshwater Clarifier, 8-fl oz bottle slide 3 of 8

Aqueon Freshwater Clarifier, 8-fl oz bottle slide 4 of 8

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Aqueon Freshwater Clarifier, 8-fl oz bottle

Rated 4.5 out of 5 stars

48

$5.19 Chewy Price

($0.65/fl oz) Price per Unit

$7.99 List Price

Autoship Price

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

API Copper Cu+ Freshwater & Saltwater Aquarium Test Kit, 90 count

Rated 3.8 out of 5 stars

6

$12.48 Chewy Price

($0.14/ea) Price per Unit

$17.48 List Price

Autoship Price

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

Dennerle NPK Booster Macro-Fertilizer Aquarium Plant Fertilizer, 100-mL bottle

Rated 4.3 out of 5 stars

6

$12.99 Chewy Price

($0.13/mL) Price per Unit

Autoship Price

Free delivery on first-time orders over $35
Free 365-day returns
Arrives between Jul 23 and Jul 26

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Dr. Tim's Aquatics Re-Fresh Freshwater Aquarium Cleaner, 8-fl oz bottle

Rated 4.7 out of 5 stars

7

$26.99 Chewy Price

($3.38/fl oz) Price per Unit

$39.99 List Price

Autoship Price

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

Salifert Aquarium Oxygen Test Kit

Rated 4.7 out of 5 stars

6

$14.89 Chewy Price

Autoship Price

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

Penn-Plax Pro-Carb Aquarium Cleaner, 28-oz bottle

Rated 3.5 out of 5 stars

2

$21.98 Chewy Price

($0.79/oz) Price per Unit

$24.99 List Price

Autoship Price

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

Dr. Tim's Aquatics Shrimp Waste-Away Water Conditioner, 4-fl oz bottle

Rated 5 out of 5 stars

1

$11.79 Chewy Price

($2.95/fl oz) Price per Unit

$14.99 List Price

Autoship Price

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

Fluval CO2 Aquarium Indicator Kit

Rated 2.2 out of 5 stars

6

$16.99 Chewy Price

Autoship Price

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

API Stress Zyme Freshwater & Saltwater Aquarium Cleaning Solution, 32-fl oz bottle

Rated 4.9 out of 5 stars

14

$41.98 Chewy Price

($1.32/fl oz) Price per Unit

Autoship Price

Free 1-3 day delivery on first-time orders
Free 365-day returns

Fritz Aquarium Water Nitrite Test Kit

Rated 3 out of 5 stars

1

$11.99 Chewy Price

$15.99 List Price

Autoship Price

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

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Dr. Tim's Aquatics Shrimp First Defense Water Conditioner, 4-fl oz bottle

$11.29 Chewy Price

($2.83/fl oz) Price per Unit

$13.99 List Price

Autoship Price

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

AquaZen Aquarium Water Conditioner - Dechlorinator, 4.06-fl oz bottle

Rated 5 out of 5 stars

2

$6.99 Chewy Price

($1.73/fl oz) Price per Unit

Autoship Price

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

Dennerle S7 VitaMix Vital Substances Aquarium Plant Treatment, 50-mL bottle

Rated 1 out of 5 stars

1

$12.99 Chewy Price

($0.26/mL) Price per Unit

Autoship Price

Free delivery on first-time orders over $35
Free 365-day returns
Arrives between Jul 23 and Jul 26

API Replacement Test Tubes for Aquarium Liquid Test Kits, 24 count

Rated 3.3 out of 5 stars

22

$24.45 Chewy Price

($1.02/ea) Price per Unit

$41.98 List Price

Autoship Price

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

Salifert Aquarium Copper Test Kit

Rated 5 out of 5 stars

2

$14.42 Chewy Price

$16.97 List Price

Autoship Price

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

Dr. Tim's Aquatics Waste-Away Gel Plant Water Conditioner, Medium, 2 count

Rated 1 out of 5 stars

1

$23.91 Chewy Price

($11.96/ea) Price per Unit

$35.99 List Price

Autoship Price

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

Fritz RPM Elements Calcium Aquarium Water Treatment, 1-gal bottle

Rated 5 out of 5 stars

3

$27.49 Chewy Price

($27.49/gl) Price per Unit

Autoship Price

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

Fluval Ammonia Fish Water Test Kit

Rated 4.8 out of 5 stars

4

$18.20 Chewy Price

$18.99 List Price

Autoship Price

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

New

Aquatop Clear Magic Freshwater Fish Water Conditioner, 30-gal, 6 count

$11.99 Chewy Price

($0.07/gl) Price per Unit

Autoship Price

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

API Freshwater Aquarium Salt, 50-lb

Rated 5 out of 5 stars

5

$112.48 Chewy Price

($2.25/lb) Price per Unit

$157.48 List Price

Autoship Price

Free 1-3 day delivery on first-time orders
Free 365-day returns

Dr. Tim's Aquatics Freshwater Waste-Away Aquarium Cleaner, 4-fl oz bottle

$11.89 Chewy Price

($2.98/oz) Price per Unit

$14.99 List Price

Autoship Price

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

Microbe-Lift TheraP Aquarium Fish Water Treatment, 16-oz bottle

Rated 3.3 out of 5 stars

7

$16.32 Chewy Price

($1.02/oz) Price per Unit

$20.99 List Price

Autoship Price

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

biOrb Aquarium Service Kit 3 Plus Water Optimizer

Rated 4.7 out of 5 stars

43

$31.00 Chewy Price

$36.99 List Price

Autoship Price

Free delivery on first-time orders over $35
Free 365-day returns
Arrives between Jul 19 and Jul 25

API pH Freshwater & Saltwater Aquarium Test Strips, 25 count

Rated 4.4 out of 5 stars

10

$15.99 Chewy Price

($0.64/ea) Price per Unit

$18.28 List Price

Autoship Price

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

Ruby Reef Rally NANO Formula Aquarium Water Treatment, 8-fl oz bottle

Rated 4.7 out of 5 stars

3

$8.99 Chewy Price

($1.13/fl oz) Price per Unit

Autoship Price

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

Dr. Tim's Aquatics Freshwater Waste-Away Gel Water Conditioner, Small: 10-gal, 1 count

Rated 2 out of 5 stars

1

$14.98 Chewy Price

($14.98/ea) Price per Unit

$14.99 List Price

Autoship Price

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

Dr. Tim's Aquatics Shrimp Water Conditioner, 32-fl oz bottle

$7.96 Chewy Price

($0.25/fl oz) Price per Unit

$8.99 List Price

Autoship Price

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

Fluval Disposable CO2 Cartridge Fish CO2 Care, 3 count

Rated 3.5 out of 5 stars

6

$69.99 Chewy Price

($23.33/ea) Price per Unit

Autoship Price

Free 1-3 day delivery on first-time orders
Free 365-day returns

Fluval Nitrite Fish Water Test Kit

Rated 5 out of 5 stars

1

$16.99 Chewy Price

Autoship Price

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

Dr. Tim's Aquatics Shrimp Waste-Away Gel Water Conditioner, Small, 2 count

$19.29 Chewy Price

($9.65/ea) Price per Unit

$23.99 List Price

Autoship Price

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

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Dr. Tim's Aquatics Shrimp One & Only Water Conditioner, 2-fl oz bottle

$13.41 Chewy Price

($6.71/fl oz) Price per Unit

$16.99 List Price

Autoship Price

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

Dennerle Profi-Line CO2 Maxi Flipper Fish Aquarium Diffuser

Rated 5 out of 5 stars

1

$72.00 Chewy Price

Autoship Price

Free delivery on first-time orders
Free 365-day returns
Arrives between Jul 23 and Jul 26

Dr. Tim's Aquatics Waste-Away Gel Turtle Water Conditioner, Medium, 2 count

$29.19 Chewy Price

($14.60/ea) Price per Unit

$35.99 List Price

Autoship Price

Free 1-3 day delivery on first-time orders over $35
Free 365-day returns

Tropical Fish Tank Health & Water Care

Tetra SafeStart Plus for Freshwater Aquariums, 8.45-fl oz bottle

Hydrospace PNS ProBio Fish Aquarium Additive, Maroon, 16-fl oz

ASF SeaTest Mg2+ Magnesium Fish Aquarium Water Test Kit, 40 count

Aqueon Freshwater Clarifier, 8-fl oz bottle

API Copper Cu+ Freshwater & Saltwater Aquarium Test Kit, 90 count

Dennerle NPK Booster Macro-Fertilizer Aquarium Plant Fertilizer, 100-mL bottle

Dr. Tim's Aquatics Re-Fresh Freshwater Aquarium Cleaner, 8-fl oz bottle

Salifert Aquarium Oxygen Test Kit

Penn-Plax Pro-Carb Aquarium Cleaner, 28-oz bottle

Dr. Tim's Aquatics Shrimp Waste-Away Water Conditioner, 4-fl oz bottle

Fluval CO2 Aquarium Indicator Kit

API Stress Zyme Freshwater & Saltwater Aquarium Cleaning Solution, 32-fl oz bottle

Fritz Aquarium Water Nitrite Test Kit

Dr. Tim's Aquatics Shrimp First Defense Water Conditioner, 4-fl oz bottle

AquaZen Aquarium Water Conditioner - Dechlorinator, 4.06-fl oz bottle

Dennerle S7 VitaMix Vital Substances Aquarium Plant Treatment, 50-mL bottle

API Replacement Test Tubes for Aquarium Liquid Test Kits, 24 count

Salifert Aquarium Copper Test Kit

Dr. Tim's Aquatics Waste-Away Gel Plant Water Conditioner, Medium, 2 count

Fritz RPM Elements Calcium Aquarium Water Treatment, 1-gal bottle

Fluval Ammonia Fish Water Test Kit

Aquatop Clear Magic Freshwater Fish Water Conditioner, 30-gal, 6 count

API Freshwater Aquarium Salt, 50-lb

Dr. Tim's Aquatics Freshwater Waste-Away Aquarium Cleaner, 4-fl oz bottle

Microbe-Lift TheraP Aquarium Fish Water Treatment, 16-oz bottle

biOrb Aquarium Service Kit 3 Plus Water Optimizer

API pH Freshwater & Saltwater Aquarium Test Strips, 25 count

Ruby Reef Rally NANO Formula Aquarium Water Treatment, 8-fl oz bottle

Dr. Tim's Aquatics Freshwater Waste-Away Gel Water Conditioner, Small: 10-gal, 1 count

Dr. Tim's Aquatics Shrimp Water Conditioner, 32-fl oz bottle

Fluval Disposable CO2 Cartridge Fish CO2 Care, 3 count

Fluval Nitrite Fish Water Test Kit

Dr. Tim's Aquatics Shrimp Waste-Away Gel Water Conditioner, Small, 2 count

Dr. Tim's Aquatics Shrimp One & Only Water Conditioner, 2-fl oz bottle

Dennerle Profi-Line CO2 Maxi Flipper Fish Aquarium Diffuser

Dr. Tim's Aquatics Waste-Away Gel Turtle Water Conditioner, Medium, 2 count

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