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
Acurel F Aquarium Water Clarifier, 50-mL bottle

Acurel F Aquarium Water Clarifier, 50-mL bottle

Rated 4.6 out of 5 stars
103
$8.24Chewy Price
Promo, Spend $100, Get $30 eGift Card with code HAVEFUN

Our ratings

Ease of Use

4.7/5
Excellent

Effectiveness

4.7/5
Excellent

Ingredients

4.7/5
Excellent

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
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 4.6 out of 5 stars
64
$47.87Chewy Price
($47.87/gl)
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

4.8/5
Excellent

Longevity

4.6/5
Excellent

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

Aquarium Type

Pond

Fish Type

Koi & Pond Fish
3
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
232
$8.77Chewy Price
($1.10/fl oz)
Promo, Spend $100, Get $30 eGift Card with code HAVEFUN

Our ratings

Ease of Use

4.3/5
Great

Effectiveness

4.5/5
Great

Ingredients

4.2/5
Great

Longevity

4.3/5
Great

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
199
$9.99Chewy Price
($9.99/ea)
Promo, Spend $100, Get $30 eGift Card with code HAVEFUN

Our ratings

Ease of Use

4.2/5
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
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 4.2 out of 5 stars
60
$39.61Chewy Price
($0.40/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

4.3/5
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
Summit Clear-Water Barley Straw Extract Pond Treatment, 32-oz bottle

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

Rated 4.2 out of 5 stars
52
$22.49Chewy Price
($0.71/oz)
Promo, Spend $100, Get $30 eGift Card with code HAVEFUN

Our ratings

Ease of Use

4.5/5
Great

Effectiveness

4.4/5
Great

Ingredients

4.5/5
Great

Longevity

4.5/5
Great

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

Aquarium Type

Pond

Fish Type

Koi & Pond Fish
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 4.9 out of 5 stars
14
$68.93Chewy Price
($68.93/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
API Pond Ecofix Sludge Destroyer Pond Water Clarifier & Sludge Remover, 16-fl oz bottle
API Pond Ecofix Sludge Destroyer Pond Water Clarifier & Sludge Remover, 16-fl oz bottle
API Pond Ecofix Sludge Destroyer Pond Water Clarifier & Sludge Remover, 16-fl oz bottle
API Pond Ecofix Sludge Destroyer Pond Water Clarifier & Sludge Remover, 16-fl oz bottle
API Pond Ecofix Sludge Destroyer Pond Water Clarifier & Sludge Remover, 16-fl oz bottle

API Pond Ecofix Sludge Destroyer Pond Water Clarifier & Sludge Remover, 16-fl oz bottle

Rated 4.5 out of 5 stars
40
$16.98Chewy Price
($1.07/fl oz)
Promo, Spend $100, Get $30 eGift Card with code HAVEFUN

Our ratings

Ease of Use

4.8/5
Excellent

Effectiveness

4.8/5
Excellent

Ingredients

4.8/5
Excellent

Longevity

4.8/5
Excellent

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

Aquarium Type

Pond

Fish Type

Koi & Pond Fish
9
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
17
$24.64Chewy Price
($4.11/g)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Ease of Use

4.6/5
Excellent

Effectiveness

4.6/5
Excellent

Ingredients

4.6/5
Excellent

Longevity

4.6/5
Excellent

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

Aquarium Type

Freshwater

Fish Type

Tropical Freshwater
10
Tetra No More Algae Controls Algae Growth for Water Clarity, 8 count
Tetra No More Algae Controls Algae Growth for Water Clarity, 8 count
Tetra No More Algae Controls Algae Growth for Water Clarity, 8 count
Tetra No More Algae Controls Algae Growth for Water Clarity, 8 count
Tetra No More Algae Controls Algae Growth for Water Clarity, 8 count
Tetra No More Algae Controls Algae Growth for Water Clarity, 8 count
Tetra No More Algae Controls Algae Growth for Water Clarity, 8 count

Tetra No More Algae Controls Algae Growth for Water Clarity, 8 count

Rated 4.5 out of 5 stars
97
$4.09Chewy Price
($0.52/ea)
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

4.1/5
Great

Longevity

4.2/5
Great

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

Aquarium Type

Freshwater

Fish Type

Tropical Freshwater