10 Best Aquarium Salts 2025: According to Reviews | Chewy

The 10 Best Aquarium Salts

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How we created this aquarium salt list

We leveraged input from our veterinarians and artificial intelligence to identify key considerations to help you find the best aquarium salt.
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 aquarium salts.

Key aquarium salt considerations

Concentration

Effectiveness

Ingredients

Solubility

1
Instant Ocean Sea Salt for Aquariums, 200-gal
Instant Ocean Sea Salt for Aquariums, 200-gal
Instant Ocean Sea Salt for Aquariums, 200-gal
Instant Ocean Sea Salt for Aquariums, 200-gal
Instant Ocean Sea Salt for Aquariums, 200-gal
Instant Ocean Sea Salt for Aquariums, 200-gal

Instant Ocean Sea Salt for Aquariums, 200-gal

Rated 4.7 out of 5 stars
375
$69.09Chewy Price
($0.35/gl)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Concentration

4.4/5
Great

Effectiveness

4.5/5
Great

Ingredients

4.5/5
Great

Solubility

4.4/5
Great

Is this aquarium salt right for my pet?

Aquarium Type

Saltwater

Fish Type

Marine Fish, Marine Invertebrate
2
Instant Ocean Reef Salt for Aquariums, 200-gal
Instant Ocean Reef Salt for Aquariums, 200-gal
Instant Ocean Reef Salt for Aquariums, 200-gal
Instant Ocean Reef Salt for Aquariums, 200-gal
Instant Ocean Reef Salt for Aquariums, 200-gal

Instant Ocean Reef Salt for Aquariums, 200-gal

Rated 4.6 out of 5 stars
330
$69.88Chewy Price
($0.35/gl)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Concentration

4.3/5
Great

Effectiveness

4.3/5
Great

Ingredients

4.3/5
Great

Solubility

4.3/5
Great

Is this aquarium salt right for my pet?

Aquarium Type

Saltwater

Fish Type

Marine Invertebrate, Marine Fish
3
API Freshwater Aquarium Salt, 65-oz carton
API Freshwater Aquarium Salt, 65-oz carton
API Freshwater Aquarium Salt, 65-oz carton
API Freshwater Aquarium Salt, 65-oz carton
API Freshwater Aquarium Salt, 65-oz carton
API Freshwater Aquarium Salt, 65-oz carton
API Freshwater Aquarium Salt, 65-oz carton

API Freshwater Aquarium Salt, 65-oz carton

Rated 4.6 out of 5 stars
277
$12.48Chewy Price
($0.20/oz)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Concentration

4.1/5
Great

Effectiveness

4.4/5
Great

Ingredients

4.2/5
Great

Solubility

3.7/5
Good

Is this aquarium salt right for my pet?

Aquarium Type

Freshwater

Fish Type

Tropical Freshwater, Betta, Goldfish, Bottom Feeder...
4
AquaForest Reef Salt Mix for Aquariums, 16-gal bag
AquaForest Reef Salt Mix for Aquariums, 16-gal bag

AquaForest Reef Salt Mix for Aquariums, 16-gal bag

Rated 4.6 out of 5 stars
9
$10.99Chewy Price
($0.69/gl)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Concentration

4.8/5
Excellent

Effectiveness

4.8/5
Excellent

Ingredients

4.8/5
Excellent

Solubility

4.8/5
Excellent

Is this aquarium salt right for my pet?

Aquarium Type

Saltwater

Fish Type

Marine Fish, Marine Invertebrate
5
Nature's Ocean Nutri-SeaWater Natural Live Ocean Aquarium Saltwater, 4.4-gal jug
Nature's Ocean Nutri-SeaWater Natural Live Ocean Aquarium Saltwater, 4.4-gal jug
Nature's Ocean Nutri-SeaWater Natural Live Ocean Aquarium Saltwater, 4.4-gal jug

Nature's Ocean Nutri-SeaWater Natural Live Ocean Aquarium Saltwater, 4.4-gal jug

Rated 4.2 out of 5 stars
66
$22.99Chewy Price
($5.23/gl)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Concentration

4.4/5
Great

Effectiveness

4.4/5
Great

Ingredients

4.0/5
Great

Solubility

4.0/5
Great

Is this aquarium salt right for my pet?

Aquarium Type

Saltwater

Fish Type

Marine Fish
6
SunGrow Betta Fish Water Conditioner & Treatment Freshwater Fish Aquarium Salt, 16-oz bag
SunGrow Betta Fish Water Conditioner & Treatment Freshwater Fish Aquarium Salt, 16-oz bag
SunGrow Betta Fish Water Conditioner & Treatment Freshwater Fish Aquarium Salt, 16-oz bag

SunGrow Betta Fish Water Conditioner & Treatment Freshwater Fish Aquarium Salt, 16-oz bag

Rated 4.6 out of 5 stars
7
$6.99Chewy Price
($0.44/oz)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Concentration

4.7/5
Excellent

Effectiveness

4.6/5
Excellent

Ingredients

4.4/5
Great

Solubility

4.7/5
Excellent

Is this aquarium salt right for my pet?

Aquarium Type

Freshwater

Fish Type

Betta, Goldfish, Tropical Freshwater, Cichlid
7
API Pond Salt, 4.4-lb carton
API Pond Salt, 4.4-lb carton
API Pond Salt, 4.4-lb carton
API Pond Salt, 4.4-lb carton
API Pond Salt, 4.4-lb carton
API Pond Salt, 4.4-lb carton
API Pond Salt, 4.4-lb carton

API Pond Salt, 4.4-lb carton

Rated 4.8 out of 5 stars
47
$10.48Chewy Price
($2.39/lb)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Concentration

4.2/5
Great

Effectiveness

4.6/5
Excellent

Ingredients

4.3/5
Great

Solubility

4.1/5
Great

Is this aquarium salt right for my pet?

Aquarium Type

Pond

Fish Type

Koi & Pond Fish
8
Fritz ProAquatics Reef Pro Mix Redline Complete Aquarium Sea Salt, 55-lb box

Fritz ProAquatics Reef Pro Mix Redline Complete Aquarium Sea Salt, 55-lb box

Rated 4.3 out of 5 stars
9
$72.24Chewy Price
($1.32/lb)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Concentration

4.4/5
Great

Effectiveness

4.5/5
Great

Ingredients

4.2/5
Great

Solubility

4.5/5
Great

Is this aquarium salt right for my pet?

Aquarium Type

Freshwater, Saltwater

Fish Type

Marine Fish
9
Fritz ProAquatics Reef Pro Mix Complete Aquarium Sea Salt, 55-lb box

Fritz ProAquatics Reef Pro Mix Complete Aquarium Sea Salt, 55-lb box

Rated 4.4 out of 5 stars
18
$72.24Chewy Price
($1.32/lb)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Concentration

4.5/5
Great

Effectiveness

4.3/5
Great

Ingredients

4.2/5
Great

Solubility

4.4/5
Great

Is this aquarium salt right for my pet?

Aquarium Type

Freshwater, Saltwater

Fish Type

Marine Fish
10
Fluval Sea Magnesium Aquarium Water Conditioner, 8-oz bottle

Fluval Sea Magnesium Aquarium Water Conditioner, 8-oz bottle

Rated 4.5 out of 5 stars
4
$9.25Chewy Price
($1.16/oz)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Concentration

4.4/5
Great

Effectiveness

4.4/5
Great

Ingredients

4.4/5
Great

Solubility

4.4/5
Great

Is this aquarium salt right for my pet?

Aquarium Type

Saltwater

Fish Type

Marine Fish