Tetra AlgaeControl Freshwater Aquarium Algaecide, 3.38-fl oz bottle

Deal
Skip image gallery
Slide 1 of 10
$4.21 First Time Autoship Price
this order
Save 35% (up to $20) today when you set up Autoship. 
$6.16 Autoship Price
(-5%) future orders
  • Keep saving 5% on every order
  • Get deliveries on your schedule
  • Skip, change, or cancel anytime
$6.48 Chewy Price
($1.92 /fl oz)
Save $1.01 (-13%)
$7.49 List Price
Promo, Spend $100, Get $30 eGift Card with code NEWYEAR
Promo, New Customers Only: Spend $49+, Get $20 eGift Card + Free Shipping with code: WELCOME
In Stock
FREE 1-3 day delivery on first-time orders over $35
Free 365-day returns

No interest if paid in full in 6 months on PayPal purchases of $149+. .

About This Item

Details

  • Broad spectrum algae remover
  • Removes and prevents return
  • Safe for use in planted aquariums unlike most products
  • Treats glass, filters, décor everything will be squeaky clean
  • With precision dropper

Instructions

Learn More About Tetra From Our Team of Experts

Questions & Answers

19 Customer Questions

Is this safe to use in my betta fish tanks?

Answer by Chewy • Feb 12, 2018
The Algaecide can be used in a betta fish tank.

Is this safe for bottom feeders like Corydoras Catfish or Sucker Catfish?

Answer by Chewy • Jul 19, 2018
This product is not recommended for scaleless fish. Tetra recommends their Tetra Pond Barley & Peat Extract Clear Water Treatment for cases involving scaleless or sensitive fish.

How long should you wait after first treatment of using Tetra algaecide to treat again

Answer by Chewy • Mar 18, 2021
Repeat if needed every three days for up to three total doses, then clean the aquarium of dead algae, and do a partial water change. For regular maintenance, use as algae starts to reappear.

Can you use Tetra cleaning bacteria for aquarium with frogs.

Answer by Chewy • Sep 22, 2021
This product should only be used in tanks with plants and fish. It is not intended for use with vertebrates or crustaceans.
Reviews
Write a Review
3.9
Rated 3.9 out of 5 stars
76 Ratings
Terms & Conditions

47 Customer Reviews

Rated 1 out of 5 stars
By Joan on Mar 21, 2025

Not safe to use for fish

I used this in my aquarium and my fish were dying and I didn't want 2 bottles. I'm sad about my fish dying. And my friend used some in his aquarium too and all his

I used this in my aquarium and my fish were dying and I didn't want 2 bottles. I'm sad about my fish dying. And my friend used some in his aquarium too and all his fish died

Rated 5 out of 5 stars
By Denise on May 2, 2025

Clear Tank

It wasn't until I used this product that I finally got the algae in my tank under control. Now it is crystal clear.

It wasn't until I used this product that I finally got the algae in my tank under control. Now it is crystal clear.

Rated 1 out of 5 stars
By Michele on Apr 14, 2025

NEVER BUY THIS POISON

Killed my entire fish tank under the recommended dosage. I have spoke with others that have had the same terrible outcome.

Killed my entire fish tank under the recommended dosage. I have spoke with others that have had the same terrible outcome.

Rated 5 out of 5 stars
By Margaret on Sep 2, 2025

Great

It works perfect

It works perfect

Rated 5 out of 5 stars
By Patty on May 8, 2025

Received the item promptly

The item was not damaged

The item was not damaged

Rated 1 out of 5 stars
By Chip on Nov 10, 2024

Warning do not use if you have any live plants

It said nothing online that you could not have live plants in your aquarium and use this stuff.

It said nothing online that you could not have live plants in your aquarium and use this stuff.

Rated 5 out of 5 stars
By Fishnana on Aug 7, 2022

Excellent!

Super easy to order, phenomenal fast delivery! (On a Sunday!) Product works great!

Super easy to order, phenomenal fast delivery! (On a Sunday!) Product works great!

Rated 5 out of 5 stars
By ATurner on Apr 25, 2021

Cleared water quickly

Turned green water into crystal clear in under 24 hours!

Turned green water into crystal clear in under 24 hours!

Rated 1 out of 5 stars
By James on Apr 12, 2021

product does not work

Product does not work at all. Used product as instructed but showed no results!

Product does not work at all. Used product as instructed but showed no results!

Rated 5 out of 5 stars
By Vance on Jan 26, 2021

Great so far

I had terrible brown algae. A tank cleaning worked for a week and it was back. I tried this product and after a second application my tank has been crystal clear

I had terrible brown algae. A tank cleaning worked for a week and it was back. I tried this product and after a second application my tank has been crystal clear. Fish seem to be fine.