10 Best Aquarium Algaecides & Water Clarifiers 2026: According to Reviews | Chewy

The 10 Best Aquarium Algaecides & Water Clarifiers

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How we created this aquarium algaecides & water clarifier list

We leveraged input from our veterinarians and artificial intelligence to identify key considerations to help you find the best aquarium algaecides & water clarifier.
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 algaecides & water clarifiers.

Key aquarium algaecides & water clarifier considerations

Ease of Use

Effectiveness

Ingredients

Longevity

1
Microbe-Lift PL Pond & Lagoon Bacteria Water Treatment, 1-gal
Microbe-Lift PL Pond & Lagoon Bacteria Water Treatment, 1-gal
Microbe-Lift PL Pond & Lagoon Bacteria Water Treatment, 1-gal
Microbe-Lift PL Pond & Lagoon Bacteria Water Treatment, 1-gal
Microbe-Lift PL Pond & Lagoon Bacteria Water Treatment, 1-gal
Microbe-Lift PL Pond & Lagoon Bacteria Water Treatment, 1-gal
Microbe-Lift PL Pond & Lagoon Bacteria Water Treatment, 1-gal
Microbe-Lift PL Pond & Lagoon Bacteria Water Treatment, 1-gal
Microbe-Lift PL Pond & Lagoon Bacteria Water Treatment, 1-gal

Microbe-Lift PL Pond & Lagoon Bacteria Water Treatment, 1-gal

Rated 4.7 out of 5 stars
99
$52.95Chewy Price
($52.95/gl)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Ease of Use

4.5/5
Great

Effectiveness

4.7/5
Excellent

Ingredients

4.7/5
Excellent

Longevity

4.5/5
Great

Is this aquarium algaecides & water clarifier right for my pet?

Aquarium Type

Pond

Fish Type

Koi & Pond Fish
2
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
297
$9.48Chewy Price
($1.19/fl oz)
Promo, Spend $100, Get $30 eGift Card with code NEWYEAR

Our ratings

Ease of Use

4.5/5
Great

Effectiveness

4.5/5
Great

Ingredients

4.4/5
Great

Longevity

4.4/5
Great

Is this aquarium algaecides & water clarifier right for my pet?

Aquarium Type

Freshwater

Fish Type

Tropical Freshwater, Betta, Cichlid, Goldfish...
3
Summit Clear-Water Barley Straw Pond Treatment, 1 count
Summit Clear-Water Barley Straw Pond Treatment, 1 count
Summit Clear-Water Barley Straw Pond Treatment, 1 count
Summit Clear-Water Barley Straw Pond Treatment, 1 count
Summit Clear-Water Barley Straw Pond Treatment, 1 count
Summit Clear-Water Barley Straw Pond Treatment, 1 count
Summit Clear-Water Barley Straw Pond Treatment, 1 count
Summit Clear-Water Barley Straw Pond Treatment, 1 count

Summit Clear-Water Barley Straw Pond Treatment, 1 count

Rated 4.3 out of 5 stars
291
$9.59Chewy Price
($9.59/ea)
Promo, Spend $100, Get $30 eGift Card with code NEWYEAR

Our ratings

Ease of Use

4.1/5
Great

Effectiveness

3.9/5
Good

Ingredients

4.2/5
Great

Longevity

4.0/5
Great

Is this aquarium algaecides & water clarifier right for my pet?

Top Ingredient

Barley Straw

Aquarium Type

Pond

Fish Type

Koi & Pond Fish
4
Acurel F Aquarium Water Clarifier, 50-mL bottle

Acurel F Aquarium Water Clarifier, 50-mL bottle

Rated 4.5 out of 5 stars
138
$8.99Chewy Price
Promo, Spend $100, Get $30 eGift Card with code NEWYEAR

Our ratings

Ease of Use

4.3/5
Great

Effectiveness

4.4/5
Great

Ingredients

4.2/5
Great

Longevity

4.4/5
Great

Is this aquarium algaecides & water clarifier right for my pet?

Aquarium Type

Freshwater

Fish Type

Tropical Freshwater, Betta, Cichlid, Goldfish
5
Tetra Pond AlgaeControl Water Treatment, 101.4-fl oz bottle
Tetra Pond AlgaeControl Water Treatment, 101.4-fl oz bottle
Tetra Pond AlgaeControl Water Treatment, 101.4-fl oz bottle
Tetra Pond AlgaeControl Water Treatment, 101.4-fl oz bottle
Tetra Pond AlgaeControl Water Treatment, 101.4-fl oz bottle

Tetra Pond AlgaeControl Water Treatment, 101.4-fl oz bottle

Rated 4.4 out of 5 stars
78
$39.50Chewy Price
($0.39/fl oz)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Ease of Use

4.6/5
Excellent

Effectiveness

4.4/5
Great

Ingredients

4.4/5
Great

Longevity

4.3/5
Great

Is this aquarium algaecides & water clarifier right for my pet?

Aquarium Type

Pond

Fish Type

Koi & Pond Fish
6
Boyd Chemi-Clean Red Cyanobacteria Aquarium Treatment, 2-g

Boyd Chemi-Clean Red Cyanobacteria Aquarium Treatment, 2-g

Rated 4.8 out of 5 stars
20
$17.99Chewy Price
($9.00/g)
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

Longevity

4.7/5
Excellent

Is this aquarium algaecides & water clarifier right for my pet?

Aquarium Type

Freshwater

Fish Type

Tropical Freshwater
7
Tetra Algae Control Pond Block Water Treatment, 50 count
Tetra Algae Control Pond Block Water Treatment, 50 count
Tetra Algae Control Pond Block Water Treatment, 50 count
Tetra Algae Control Pond Block Water Treatment, 50 count
Tetra Algae Control Pond Block Water Treatment, 50 count
Tetra Algae Control Pond Block Water Treatment, 50 count
Tetra Algae Control Pond Block Water Treatment, 50 count

Tetra Algae Control Pond Block Water Treatment, 50 count

Rated 4.5 out of 5 stars
90
$63.64Chewy Price
($1.28/ea)
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

4.2/5
Great

Longevity

4.5/5
Great

Is this aquarium algaecides & water clarifier right for my pet?

Aquarium Type

Pond

Fish Type

Koi & Pond Fish
8
API Algaefix Algae Control Aquarium Solution, 16-fl oz bottle
API Algaefix Algae Control Aquarium Solution, 16-fl oz bottle
API Algaefix Algae Control Aquarium Solution, 16-fl oz bottle
API Algaefix Algae Control Aquarium Solution, 16-fl oz bottle
API Algaefix Algae Control Aquarium Solution, 16-fl oz bottle
API Algaefix Algae Control Aquarium Solution, 16-fl oz bottle
API Algaefix Algae Control Aquarium Solution, 16-fl oz bottle

API Algaefix Algae Control Aquarium Solution, 16-fl oz bottle

Rated 4.1 out of 5 stars
215
$15.18Chewy Price
($0.95/fl oz)
Promo, Spend $100, Get $30 eGift Card with code NEWYEAR

Our ratings

Ease of Use

4.3/5
Great

Effectiveness

4.3/5
Great

Ingredients

4.1/5
Great

Longevity

4.1/5
Great

Is this aquarium algaecides & water clarifier right for my pet?

Aquarium Type

Freshwater

Fish Type

Tropical Freshwater, Betta, Cichlid, Goldfish
9
Kordon AmQuel Plus Ammonia Detoxifier Aquarium Water Conditioner, 1-gal bottle

Kordon AmQuel Plus Ammonia Detoxifier Aquarium Water Conditioner, 1-gal bottle

Rated 4.8 out of 5 stars
20
$55.98Chewy Price
($55.98/gl)
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

4.6/5
Excellent

Longevity

4.6/5
Excellent

Is this aquarium algaecides & water clarifier right for my pet?

Aquarium Type

Freshwater, Saltwater

Fish Type

Marine Fish, Tropical Freshwater
10
Microbe-Lift Sludge Away Pond Water Care, 1-gal jug
Microbe-Lift Sludge Away Pond Water Care, 1-gal jug
Microbe-Lift Sludge Away Pond Water Care, 1-gal jug
Microbe-Lift Sludge Away Pond Water Care, 1-gal jug
Microbe-Lift Sludge Away Pond Water Care, 1-gal jug
Microbe-Lift Sludge Away Pond Water Care, 1-gal jug

Microbe-Lift Sludge Away Pond Water Care, 1-gal jug

Rated 4.6 out of 5 stars
19
$61.99Chewy Price
($61.99/gl)
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

Longevity

4.4/5
Great

Is this aquarium algaecides & water clarifier right for my pet?

Aquarium Type

Pond

Fish Type

Koi & Pond Fish