API CO2 Booster Freshwater Aquarium Plant Care Treatment, 16-oz bottle

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About This Item

Details

  • This liquid treatment supplies simple carbon compounds and slowly releases CO₂ that plants can absorb through the water
  • Promotes a vibrant, healthy planted aquarium for any-level aquarist.
  • Safe for use with freshwater fish and will not alter the pH of your tank.
  • Use daily alone or with CO2 systems—different tanks have different needs.
  • Carbon is an essential element used by aquarium plants for photosynthesis, and absolutely necessary for plant growth, development and survival.

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Questions & Answers

8 Customer Questions

Is this product safe to use with shrimp and snails in the aquarium?

Answer by Chewy • Dec 14, 2020
API CO2 BOOSTER is safe for use with shrimp and snails. Dosing directions should be followed. There is not enough chemical change in the water to affect water parameters.

is this safe for amphibians?

Answer by Chewy • Dec 18, 2023
The CO2 Booster is not known to be harmful to commonly kept aquatic amphibian pet species. It is always recommend to exercise caution with the more sensitive species and monitor your animal for the first few hours when starting to use a new additive, to make sure there is no reaction.

can I add this and api leaf zone on the same day or do I skip this one when adding leaf zone

Answer by Chewy • Dec 12, 2018
You may use any of the API products in conjunction with one another.

Can this product decrease hair algae?

Answer by Chewy • Feb 23, 2022
This product is not manufactured for algae control.
Reviews
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4.5
Rated 4.5 out of 5 stars
54 Ratings
Terms & Conditions

19 Customer Reviews

Rated 4 out of 5 stars
By Richard on Oct 29, 2025

Works better than NO Co2.

Be careful how much you use! With good plant LED'S it can bring out hair algae pretty rapidly. If using root tabs & a liquid fertizer for plants that feed in the

Be careful how much you use! With good plant LED'S it can bring out hair algae pretty rapidly. If using root tabs & a liquid fertizer for plants that feed in the water column, i use about a third recommended.

Rated 5 out of 5 stars
By Sara on Aug 2, 2025

API CO2 BOOSTER

Great product and shipping was incredibly fast! Thank You!

Great product and shipping was incredibly fast! Thank You!

Rated 2 out of 5 stars
By William on Jun 3, 2025

N/A

This API chemical never did anything for the CO2 in my tanks.

This API chemical never did anything for the CO2 in my tanks.

Rated 4 out of 5 stars
By BassetMom on Jan 14, 2025
Top 250 Contributor

Not Ready to Set Up CO2 regulator?

This is not as great as a real CO2 system, but it gives my plants the little extra boost they need to keep looking great.

This is not as great as a real CO2 system, but it gives my plants the little extra boost they need to keep looking great.

Rated 1 out of 5 stars
By Jamie on May 3, 2025

Didn't notice difference

Didn't notice it helping at all.

Didn't notice it helping at all.

Rated 5 out of 5 stars
By Jaxx on Nov 15, 2024

Plant co2

Keeps my plants green!

Keeps my plants green!

Rated 5 out of 5 stars
By Robert on Sep 20, 2024

First use

Still observing

Still observing

Rated 1 out of 5 stars
By BR1E on Nov 27, 2021

Bottles half full

I received my package today. The box was wet. I thought it might’ve rained on it. Which was ok it wouldn’t have hurt anything. I open the box and the filling paper

I received my package today. The box was wet. I thought it might’ve rained on it. Which was ok it wouldn’t have hurt anything. I open the box and the filling paper of the box is soaking wet and both of my bottles of CO2 had soaked through the box. 2 bottles were missing their lids and now I’m stuck with 2 bottles that only has half the product of what I paid for. As for how well it works this was my first time ordering it. How the lids managed to come off in the box I have no clue. Unless they were thrown in the box without lids. The box itself was pretty beat up and smashed also which still shouldn’t have made the lids twist off.

Rated 3 out of 5 stars
By Huffnpuff on Nov 29, 2021

It’s ok but time will tell

I have a new setup about 3 or 4 weeks old so I really can’t say but I do think it helps with algae on the glass.

I have a new setup about 3 or 4 weeks old so I really can’t say but I do think it helps with algae on the glass.

Rated 5 out of 5 stars
By Kelsey on Feb 12, 2021

Love this stuff

I have a 20 gallon, planted betta tank and I did not want to have to mess with an entire CO2 system. My plants weren’t doing so well and then I found this stuff

I have a 20 gallon, planted betta tank and I did not want to have to mess with an entire CO2 system. My plants weren’t doing so well and then I found this stuff. So much easier than a CO2 system if you have a low maintenance setup and my plants look beautiful now. They’re thriving!