10 Best Betta Fish Tank Water Treatments 2025: According to Reviews | Chewy

The 10 Best Betta Fish Tank Water Treatments

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How we created this betta fish tank water treatment list

We leveraged input from our veterinarians and artificial intelligence to identify key considerations to help you find the best betta fish tank water treatment.
We scanned thousands of customer reviews and ratings and scored each product based on its performance against each of the key considerations. We then considered how popular a product is with Chewy customers and combined that with its key consideration scores to create the list of the best betta fish tank water treatments.

Key betta fish tank water treatment considerations

Ease of Use

Effectiveness

Ingredients

Long-Term Benefits

1
API Stress Coat Aquarium Water Conditioner, 16-fl oz bottle
API Stress Coat Aquarium Water Conditioner, 16-fl oz bottle
API Stress Coat Aquarium Water Conditioner, 16-fl oz bottle
API Stress Coat Aquarium Water Conditioner, 16-fl oz bottle
API Stress Coat Aquarium Water Conditioner, 16-fl oz bottle
API Stress Coat Aquarium Water Conditioner, 16-fl oz bottle

API Stress Coat Aquarium Water Conditioner, 16-fl oz bottle

Rated 4.8 out of 5 stars
625
$10.99Chewy Price
($0.69/fl oz)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Ease of Use

4.5/5
Great

Effectiveness

4.6/5
Excellent

Ingredients

4.4/5
Great

Long-Term Benefits

4.7/5
Excellent

Is this betta fish tank water treatment right for my pet?

Aquarium Type

Freshwater, Saltwater

Fish Type

Tropical Freshwater, Betta, Cichlid, Goldfish...

Health Feature

Anti-Fungal / Anti-Bacterial
2
API Tap Water Conditioner, 16-fl oz bottle
API Tap Water Conditioner, 16-fl oz bottle
API Tap Water Conditioner, 16-fl oz bottle
API Tap Water Conditioner, 16-fl oz bottle
API Tap Water Conditioner, 16-fl oz bottle
API Tap Water Conditioner, 16-fl oz bottle

API Tap Water Conditioner, 16-fl oz bottle

Rated 4.8 out of 5 stars
401
$8.49Chewy Price
($0.54/fl oz)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Ease of Use

4.5/5
Great

Effectiveness

4.6/5
Excellent

Ingredients

4.6/5
Excellent

Long-Term Benefits

4.7/5
Excellent

Is this betta fish tank water treatment right for my pet?

Aquarium Type

Freshwater, Saltwater

Fish Type

Tropical Freshwater, Cichlid, Betta, Goldfish...
3
Acurel F Aquarium Water Clarifier, 50-mL bottle

Acurel F Aquarium Water Clarifier, 50-mL bottle

Rated 4.6 out of 5 stars
122
$8.99Chewy Price
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Ease of Use

4.5/5
Great

Effectiveness

4.4/5
Great

Ingredients

4.6/5
Excellent

Long-Term Benefits

4.7/5
Excellent

Is this betta fish tank water treatment right for my pet?

Aquarium Type

Freshwater

Fish Type

Tropical Freshwater, Betta, Cichlid, Goldfish
4
CaribSea Eco-Complete Planted Aquarium Substrate, Black, 20-lb bag
CaribSea Eco-Complete Planted Aquarium Substrate, Black, 20-lb bag
CaribSea Eco-Complete Planted Aquarium Substrate, Black, 20-lb bag

CaribSea Eco-Complete Planted Aquarium Substrate, Black, 20-lb bag

Rated 4.4 out of 5 stars
118
$29.99Chewy Price
($1.50/lb)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Ease of Use

4.7/5
Excellent

Effectiveness

4.5/5
Great

Ingredients

4.4/5
Great

Long-Term Benefits

4.8/5
Excellent

Is this betta fish tank water treatment right for my pet?

Material

Stone

Aquarium Type

Freshwater, Saltwater

Fish Type

Goldfish, Tropical Freshwater, Betta, Bottom Feeder...
5
SunGrow Betta Fish Indian Almond Leaves, Water Conditioner & Tank Treatment for Freshwater Aquarium
SunGrow Betta Fish Indian Almond Leaves, Water Conditioner & Tank Treatment for Freshwater Aquarium
SunGrow Betta Fish Indian Almond Leaves, Water Conditioner & Tank Treatment for Freshwater Aquarium
SunGrow Betta Fish Indian Almond Leaves, Water Conditioner & Tank Treatment for Freshwater Aquarium
SunGrow Betta Fish Indian Almond Leaves, Water Conditioner & Tank Treatment for Freshwater Aquarium
SunGrow Betta Fish Indian Almond Leaves, Water Conditioner & Tank Treatment for Freshwater Aquarium

SunGrow Betta Fish Indian Almond Leaves, Water Conditioner & Tank Treatment for Freshwater Aquarium

Rated 4.4 out of 5 stars
125
$6.97Chewy Price
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Ease of Use

4.5/5
Great

Effectiveness

4.6/5
Excellent

Ingredients

4.5/5
Great

Long-Term Benefits

4.6/5
Excellent

Is this betta fish tank water treatment right for my pet?

Material

Plant Material

Aquarium Type

Freshwater, Saltwater

Fish Type

Betta, Goldfish, Cichlid, Tropical Freshwater...

Health Feature

Anti-Fungal / Anti-Bacterial, Reproduction & Nursing
6
Tetra EasyStrips 6-in-1 Freshwater & Saltwater Aquarium Test Strips, 25 count
Tetra EasyStrips 6-in-1 Freshwater & Saltwater Aquarium Test Strips, 25 count
Tetra EasyStrips 6-in-1 Freshwater & Saltwater Aquarium Test Strips, 25 count
Tetra EasyStrips 6-in-1 Freshwater & Saltwater Aquarium Test Strips, 25 count
Tetra EasyStrips 6-in-1 Freshwater & Saltwater Aquarium Test Strips, 25 count

Tetra EasyStrips 6-in-1 Freshwater & Saltwater Aquarium Test Strips, 25 count

Rated 4.6 out of 5 stars
131
$7.13Chewy Price
($0.29/ea)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Ease of Use

4.7/5
Excellent

Effectiveness

4.4/5
Great

Ingredients

4.4/5
Great

Long-Term Benefits

4.4/5
Great

Is this betta fish tank water treatment right for my pet?

Aquarium Type

Saltwater, Freshwater

Fish Type

Tropical Freshwater, Betta, Cichlid, Goldfish...
7
API Freshwater Aquarium Master Test Kit, 800 count
API Freshwater Aquarium Master Test Kit, 800 count
API Freshwater Aquarium Master Test Kit, 800 count
API Freshwater Aquarium Master Test Kit, 800 count
API Freshwater Aquarium Master Test Kit, 800 count
API Freshwater Aquarium Master Test Kit, 800 count
API Freshwater Aquarium Master Test Kit, 800 count

API Freshwater Aquarium Master Test Kit, 800 count

Rated 4.7 out of 5 stars
280
$35.98Chewy Price
($0.05/ea)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Ease of Use

4.7/5
Excellent

Effectiveness

4.7/5
Excellent

Ingredients

4.5/5
Great

Long-Term Benefits

4.7/5
Excellent

Is this betta fish tank water treatment right for my pet?

Aquarium Type

Freshwater

Fish Type

Tropical Freshwater, Cichlid, Goldfish, Betta...
8
API Stress Zyme Freshwater & Saltwater Aquarium Water Cleaner, 16-fl oz bottle
API Stress Zyme Freshwater & Saltwater Aquarium Water Cleaner, 16-fl oz bottle
API Stress Zyme Freshwater & Saltwater Aquarium Water Cleaner, 16-fl oz bottle
API Stress Zyme Freshwater & Saltwater Aquarium Water Cleaner, 16-fl oz bottle
API Stress Zyme Freshwater & Saltwater Aquarium Water Cleaner, 16-fl oz bottle
API Stress Zyme Freshwater & Saltwater Aquarium Water Cleaner, 16-fl oz bottle

API Stress Zyme Freshwater & Saltwater Aquarium Water Cleaner, 16-fl oz bottle

Rated 4.8 out of 5 stars
201
$16.18Chewy Price
($1.02/fl oz)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Ease of Use

4.7/5
Excellent

Effectiveness

4.7/5
Excellent

Ingredients

4.7/5
Excellent

Long-Term Benefits

4.7/5
Excellent

Is this betta fish tank water treatment right for my pet?

Aquarium Type

Freshwater, Saltwater

Fish Type

Tropical Freshwater, Betta, Cichlid, Goldfish...
9
Activ-Betta Bio-Activ Live Aqueous Solution Betta Water, 33.8-fl oz bottle
Activ-Betta Bio-Activ Live Aqueous Solution Betta Water, 33.8-fl oz bottle
Activ-Betta Bio-Activ Live Aqueous Solution Betta Water, 33.8-fl oz bottle
Activ-Betta Bio-Activ Live Aqueous Solution Betta Water, 33.8-fl oz bottle

Activ-Betta Bio-Activ Live Aqueous Solution Betta Water, 33.8-fl oz bottle

Rated 4.1 out of 5 stars
30
$4.48Chewy Price
($0.14/fl oz)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Ease of Use

4.6/5
Excellent

Effectiveness

4.6/5
Excellent

Ingredients

4.6/5
Excellent

Long-Term Benefits

4.7/5
Excellent

Is this betta fish tank water treatment right for my pet?

Aquarium Type

Freshwater

Fish Type

Betta
10
API Accu-Clear Freshwater Aquarium Clarifier, 8-fl oz bottle
API Accu-Clear Freshwater Aquarium Clarifier, 8-fl oz bottle
API Accu-Clear Freshwater Aquarium Clarifier, 8-fl oz bottle
API Accu-Clear Freshwater Aquarium Clarifier, 8-fl oz bottle
API Accu-Clear Freshwater Aquarium Clarifier, 8-fl oz bottle
API Accu-Clear Freshwater Aquarium Clarifier, 8-fl oz bottle
API Accu-Clear Freshwater Aquarium Clarifier, 8-fl oz bottle

API Accu-Clear Freshwater Aquarium Clarifier, 8-fl oz bottle

Rated 4.5 out of 5 stars
265
$9.48Chewy Price
($1.19/fl oz)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Ease of Use

4.5/5
Great

Effectiveness

4.5/5
Great

Ingredients

4.5/5
Great

Long-Term Benefits

4.5/5
Great

Is this betta fish tank water treatment right for my pet?

Aquarium Type

Freshwater

Fish Type

Tropical Freshwater, Betta, Cichlid, Goldfish...