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 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
365
$8.49Chewy Price
($0.54/fl oz)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Ease of Use

4.7/5
Excellent

Effectiveness

4.8/5
Excellent

Ingredients

4.7/5
Excellent

Long-Term Benefits

4.8/5
Excellent

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

Aquarium Type

Freshwater, Saltwater

Fish Type

Tropical Freshwater, Cichlid, Betta, Goldfish...
2
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
568
$10.99Chewy Price
($0.69/fl oz)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Ease of Use

4.6/5
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, Saltwater

Fish Type

Tropical Freshwater, Betta, Cichlid, Goldfish...

Health Feature

Anti-Fungal / Anti-Bacterial
3
Fluval Plant & Shrimp Stratum Plant Care, 4.4-lb bag
Fluval Plant & Shrimp Stratum Plant Care, 4.4-lb bag
Fluval Plant & Shrimp Stratum Plant Care, 4.4-lb bag
Fluval Plant & Shrimp Stratum Plant Care, 4.4-lb bag
Fluval Plant & Shrimp Stratum Plant Care, 4.4-lb bag
Fluval Plant & Shrimp Stratum Plant Care, 4.4-lb bag
Fluval Plant & Shrimp Stratum Plant Care, 4.4-lb bag
Fluval Plant & Shrimp Stratum Plant Care, 4.4-lb bag
Fluval Plant & Shrimp Stratum Plant Care, 4.4-lb bag

Fluval Plant & Shrimp Stratum Plant Care, 4.4-lb bag

Rated 4.6 out of 5 stars
82
$14.39Chewy Price
($3.28/lb)
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

4.5/5
Great

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

Aquarium Type

Nano Tank, Freshwater

Fish Type

Tropical Freshwater, Betta, Cichlid, Goldfish
4
Acurel F Aquarium Water Clarifier, 50-mL bottle

Acurel F Aquarium Water Clarifier, 50-mL bottle

Rated 4.6 out of 5 stars
111
$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

4.5/5
Great

Long-Term Benefits

4.6/5
Excellent

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

Aquarium Type

Freshwater

Fish Type

Tropical Freshwater, Betta, Cichlid, Goldfish
5
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
110
$27.86Chewy Price
($1.40/lb)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Ease of Use

4.7/5
Excellent

Effectiveness

4.6/5
Excellent

Ingredients

4.5/5
Great

Long-Term Benefits

4.9/5
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...
6
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
117
$4.97Chewy 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

4.7/5
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
7
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
125
$7.13Chewy Price
($0.29/ea)

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

Freshwater, Saltwater

Fish Type

Tropical Freshwater, Betta, Cichlid, Goldfish...
8
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
256
$29.24Chewy Price
($0.04/ea)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Ease of Use

4.8/5
Excellent

Effectiveness

4.8/5
Excellent

Ingredients

4.8/5
Excellent

Long-Term Benefits

4.8/5
Excellent

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

Aquarium Type

Freshwater

Fish Type

Tropical Freshwater, Cichlid, Goldfish, Betta...
9
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
184
$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...
10
API Tap Water Conditioner Aquarium Water Conditioner, 32-fl oz bottle
API Tap Water Conditioner Aquarium Water Conditioner, 32-fl oz bottle
API Tap Water Conditioner Aquarium Water Conditioner, 32-fl oz bottle
API Tap Water Conditioner Aquarium Water Conditioner, 32-fl oz bottle
API Tap Water Conditioner Aquarium Water Conditioner, 32-fl oz bottle

API Tap Water Conditioner Aquarium Water Conditioner, 32-fl oz bottle

Rated 4.8 out of 5 stars
67
$16.52Chewy Price
($0.52/fl oz)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Ease of Use

4.9/5
Excellent

Effectiveness

4.9/5
Excellent

Ingredients

4.9/5
Excellent

Long-Term Benefits

4.9/5
Excellent

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

Aquarium Type

Freshwater, Saltwater

Fish Type

Marine Fish, Tropical Freshwater, Betta, Goldfish...