10 Best Aquarium Algaecides & Water Clarifiers 2025: 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
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

4.6/5
Excellent

Ingredients

4.6/5
Excellent

Longevity

4.5/5
Great

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

Aquarium Type

Freshwater

Fish Type

Tropical Freshwater, Betta, Cichlid, Goldfish...
2
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
90
$48.23Chewy Price
($48.23/gl)
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

4.7/5
Excellent

Longevity

4.5/5
Great

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

Aquarium Type

Pond

Fish Type

Koi & Pond Fish
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

4.6/5
Excellent

Ingredients

4.5/5
Great

Longevity

4.6/5
Excellent

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

Aquarium Type

Freshwater

Fish Type

Tropical Freshwater, Betta, Cichlid, Goldfish
4
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
261
$9.59Chewy Price
($9.59/ea)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Ease of Use

4.0/5
Great

Effectiveness

3.8/5
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
5
Tetra Pond AlgaeControl Water Treatment, 33.8-fl oz bottle
Tetra Pond AlgaeControl Water Treatment, 33.8-fl oz bottle
Tetra Pond AlgaeControl Water Treatment, 33.8-fl oz bottle
Tetra Pond AlgaeControl Water Treatment, 33.8-fl oz bottle

Tetra Pond AlgaeControl Water Treatment, 33.8-fl oz bottle

Rated 4.3 out of 5 stars
73
$18.17Chewy 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

4.5/5
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, 6-g

Boyd Chemi-Clean Red Cyanobacteria Aquarium Treatment, 6-g

Rated 4.8 out of 5 stars
19
$26.57Chewy Price
($4.43/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
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 4.8 out of 5 stars
18
$48.10Chewy Price
($48.10/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

4.6/5
Excellent

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

Aquarium Type

Pond

Fish Type

Koi & Pond Fish
8
Summit Clear-Water Barley Straw Extract Pond Treatment, 32-oz bottle

Summit Clear-Water Barley Straw Extract Pond Treatment, 32-oz bottle

Rated 4.1 out of 5 stars
77
$14.99Chewy Price
($0.47/oz)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Ease of Use

4.3/5
Great

Effectiveness

4.3/5
Great

Ingredients

4.3/5
Great

Longevity

4.2/5
Great

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

Aquarium Type

Pond

Fish Type

Koi & Pond Fish
9
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
201
$12.48Chewy Price
($0.78/fl oz)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Ease of Use

4.1/5
Great

Effectiveness

4.2/5
Great

Ingredients

4.0/5
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
10
Pond Boss The Block Water Care, 5-lb block
Pond Boss The Block Water Care, 5-lb block
Pond Boss The Block Water Care, 5-lb block
Pond Boss The Block Water Care, 5-lb block

Pond Boss The Block Water Care, 5-lb block

Rated 4.2 out of 5 stars
26
$67.99Chewy Price
($13.60/lb)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Ease of Use

3.9/5
Good

Effectiveness

3.9/5
Good

Ingredients

3.8/5
Good

Longevity

4.2/5
Great

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

Aquarium Type

Pond

Fish Type

Koi & Pond Fish