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

The 10 Best Goldfish Tank Water Treatments

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How we created this goldfish tank water treatment list

We leveraged input from our veterinarians and artificial intelligence to identify key considerations to help you find the best goldfish 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 goldfish tank water treatments.

Key goldfish tank water treatment considerations

Ease of Use

Effectiveness

Fish Safety

Long-Term Results

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
591
$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

4.6/5
Excellent

Fish Safety

4.5/5
Great

Long-Term Results

4.6/5
Excellent

Is this goldfish 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
374
$8.49Chewy Price
($0.54/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

Fish Safety

4.6/5
Excellent

Long-Term Results

4.6/5
Excellent

Is this goldfish 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
114
$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

Fish Safety

4.1/5
Great

Long-Term Results

4.5/5
Great

Is this goldfish 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
112
$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

4.5/5
Great

Fish Safety

4.4/5
Great

Long-Term Results

4.8/5
Excellent

Is this goldfish tank water treatment right for my pet?

Material

Stone

Aquarium Type

Freshwater, Saltwater

Fish Type

Goldfish, Tropical Freshwater, Betta, Bottom Feeder...
5
Tetra EasyBalance Plus Freshwater Aquarium Water Conditioner, 16.9-fl oz bottle
Tetra EasyBalance Plus Freshwater Aquarium Water Conditioner, 16.9-fl oz bottle
Tetra EasyBalance Plus Freshwater Aquarium Water Conditioner, 16.9-fl oz bottle
Tetra EasyBalance Plus Freshwater Aquarium Water Conditioner, 16.9-fl oz bottle
Tetra EasyBalance Plus Freshwater Aquarium Water Conditioner, 16.9-fl oz bottle
Tetra EasyBalance Plus Freshwater Aquarium Water Conditioner, 16.9-fl oz bottle

Tetra EasyBalance Plus Freshwater Aquarium Water Conditioner, 16.9-fl oz bottle

Rated 4.6 out of 5 stars
160
$13.39Chewy Price
($0.80/fl oz)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Ease of Use

4.4/5
Great

Effectiveness

4.2/5
Great

Fish Safety

4.5/5
Great

Long-Term Results

4.3/5
Great

Is this goldfish tank water treatment right for my pet?

Aquarium Type

Freshwater

Fish Type

Tropical Freshwater, Goldfish, Cichlid
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
119
$4.97Chewy Price
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Ease of Use

4.5/5
Great

Effectiveness

4.5/5
Great

Fish Safety

4.6/5
Excellent

Long-Term Results

4.5/5
Great

Is this goldfish 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
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
260
$32.91Chewy Price
($0.05/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

Fish Safety

4.8/5
Excellent

Long-Term Results

4.7/5
Excellent

Is this goldfish tank water treatment right for my pet?

Aquarium Type

Freshwater

Fish Type

Tropical Freshwater, Cichlid, Goldfish, Betta...
8
Dr. Tim's Aquatics Ammonium Chloride Solution for Cycling Aquariums, 2-fl oz bottle
Dr. Tim's Aquatics Ammonium Chloride Solution for Cycling Aquariums, 2-fl oz bottle
Dr. Tim's Aquatics Ammonium Chloride Solution for Cycling Aquariums, 2-fl oz bottle
Dr. Tim's Aquatics Ammonium Chloride Solution for Cycling Aquariums, 2-fl oz bottle
Dr. Tim's Aquatics Ammonium Chloride Solution for Cycling Aquariums, 2-fl oz bottle
Dr. Tim's Aquatics Ammonium Chloride Solution for Cycling Aquariums, 2-fl oz bottle
Dr. Tim's Aquatics Ammonium Chloride Solution for Cycling Aquariums, 2-fl oz bottle

Dr. Tim's Aquatics Ammonium Chloride Solution for Cycling Aquariums, 2-fl oz bottle

Rated 4.7 out of 5 stars
51
$5.39Chewy Price
($2.70/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

Fish Safety

4.7/5
Excellent

Long-Term Results

4.6/5
Excellent

Is this goldfish tank water treatment right for my pet?

Top Ingredient

Ammonium chloride

Aquarium Type

Freshwater, Saltwater

Fish Type

Tropical Freshwater, Marine Fish, Cichlid, Marine Invertebrate...
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
192
$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

Fish Safety

4.8/5
Excellent

Long-Term Results

4.6/5
Excellent

Is this goldfish tank water treatment right for my pet?

Aquarium Type

Freshwater, Saltwater

Fish Type

Tropical Freshwater, Betta, Cichlid, Goldfish...
10
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)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Ease of Use

4.7/5
Excellent

Effectiveness

4.4/5
Great

Fish Safety

4.2/5
Great

Long-Term Results

4.2/5
Great

Is this goldfish tank water treatment right for my pet?

Aquarium Type

Saltwater, Freshwater

Fish Type

Tropical Freshwater, Betta, Cichlid, Goldfish...