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API Co2 Booster Freshwater Aquarium Plant Treatment 16 oz Bottle

4.5 4.5 out of 5 stars 2,474 ratings

To see product details, add this item to your cart. You can always remove it later.
16 oz
Brown

Purchase options and add-ons

Brand API
Liquid Volume 16 Fluid Ounces
Item Weight 1 Pounds
Item Form Liquid
Target Species Fish

About this item

  • Contains one (1) API CO2 BOOSTER Freshwater Aquarium Plant Treatment 16-Ounce Bottle
  • Promotes plant growth in freshwater aquariums
  • Adds essential carbon in a form plants can absorb from the water
  • Can be used alone or with a CO2 system without altering aquarium pH levels
  • Use daily in order to ensure lush, vibrant aquarium plants

Customer ratings by feature

Sheerness
5.0 5.0
Easy to use
4.5 4.5
Value for money
4.1 4.1
Accuracy
4.1 4.1

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API Co2 Booster Freshwater Aquarium Plant Treatment 16 oz Bottle
API Co2 Booster Freshwater Aquarium Plant Treatment 16 oz Bottle
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Price-30% $14.28
List:$20.48
-15% $11.24
List:$13.20
-15% $30.60
Typical:$36.14
-26% $7.69
List:$10.44
-9% $15.29
List:$16.72
$22.33
Delivery
Get it as soon as Sunday, Mar 31
Get it as soon as Sunday, Mar 31
Get it as soon as Sunday, Mar 31
Get it as soon as Sunday, Mar 31
Get it as soon as Sunday, Mar 31
Get it as soon as Sunday, Mar 31
Customer Ratings
Sheerness
5.0
4.3
5.0
4.2
4.2
3.3
Easy to use
4.5
4.6
4.8
4.5
4.6
3.8
Value for money
4.1
4.2
4.6
4.2
4.5
3.8
Accuracy
4.1
4.9
4.6
4.1
4.5
Sold By
Amazon.com
Amazon.com
Amazon.com
Amazon.com
Amazon.com
One Way Pet
target species
Fish
Fish
Fish
Shrimp
Shrimp
Fish
liquid volume
16 fluid ounces
10 gallons
2 liters
250 milliliters
500 milliliters
1 liters
form
Liquid
Tablets
Liquid
Stick
Liquid
Tablets
weight
1 pounds
0.02 kilograms
3.8 pounds
0.65 pounds
1.25 pounds
0.21 pounds

From the manufacturer

api brand banner
api plant leaf zone root tabs co2 booster fertilizer planted aquarium aquatic plants

Without the addition of essential nutrients, aquarium plants will gradually yellow, drop their leaves, and eventually die. Plants take up nutrients by their roots and leaves. API LEAF ZONE plant fertilizer contains an excellent source of the necessary plant nutrients and is rapidly absorbed through plant leaves to promote lush growth and vibrant color. API ROOT TABS plant fertilizer are rich in iron to develop strong roots, rapid growth, and best coloration. Slowly releasing simple carbon compounds, API CO2 BOOSTER product aids in fueling the photosynthetic process by turning light energy into new plant growth.

planted aquarium fish aquatic plants light

Vibrant aquatic plants vs. unsightly algae

Healthy growing plants can outcompete algae. In fact, aquatic plants help reduce algae growth, as they compete for the same nutrients. Here are some guidelines to set up the right environment:

  • For thriving aquatic plants, use a lighting system type and wattage that suit them best.
  • To prevent unsightly algae growth, aquarium light should be on a maximum of 8-10 hours per day.
  • It is recommended to test the water with both API NITRATE & API PHOSPHATE TEST KITS because excess nitrate and phosphate can contribute to unsightly algae growth, and zero levels of nitrate and phosphate will hinder plant growth, so you’ll want to make sure levels are optimal.
  • To get rid of algae, use API ALGAEFIX algae control at first sight.

guppy fish planted aquarium aquatic plants freshwater api

API plant products are formulated to be used in aquariums containing freshwater fish.

If overdosed, perform a water exchange to remove excess material.

boy feeding fish

Making A Better Underwater World

At API, we understand the rewards and relaxation of fishkeeping because we have a passion for fish too. For close to 60 years API has developed premium solutions with proven and effective results for your family and ours. API offers a range of testing kits, water conditioners, and nutritionally superior food, because we’re dedicated to making a better underwater world.

Looking for specific info?

Product Description

API CO2 BOOSTER Freshwater Aquarium Plant Treatment promotes vibrant, healthy aquarium plants with easy-to-use liquid carbon, which is a necessary element used by aquarium plants for photosynthesis. API CO2 BOOSTER Freshwater Aquarium Plant Treatment supplies a concentrated source of carbon in two forms: CO2, as well as simple, organic carbon compounds. This liquid treatment supplies simple carbon compounds and slowly releases CO2 that plants can absorb through the water. May be used alone or with a CO2 system. API CO2 BOOSTER Freshwater Aquarium Plant Treatment is safe for use with freshwater fish and will not alter pH levels in aquariums. Use with API LEAF ZONE and API ROOT TABS Plant Fertilizer for complete plant care. With API Aquarium products, it’s easy to keep a beautiful saltwater, freshwater or reef aquarium. For over 50 years, API has been creating innovative, research-driven solutions that make it easier to care for your fish and aquarium. API Aquarium Treatment Supplies are designed to work in conjunction with each other to provide best results promote healthy organism growth and help fish conditions such as ich and fin rot. They work to provide a safe, hospitable environment for fish such as tropical community fish, cichlids, goldfish and more. With API, you can spend more time admiring your fish, and less time scrubbing your tank. Make sure to use all products as directed in order to ensure the best results.

Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 2 x 2 x 8 inches; 1 Pounds
  • Item model number ‏ : ‎ 579E
  • Department ‏ : ‎ Unisex-Adult
  • Date First Available ‏ : ‎ December 21, 2010
  • Manufacturer ‏ : ‎ Mars Fishcare
  • ASIN ‏ : ‎ B004GY9ZYI
  • Country of Origin ‏ : ‎ USA
  • Customer Reviews:
    4.5 4.5 out of 5 stars 2,474 ratings

Important information

Directions

Use the API Dosing Cap on Bottle. Add 1 ml for 10 U.S. gallons (38 L) or 5 ml for 50 U.S. gallons (190 L). Dose once a day.

Customer reviews

4.5 out of 5 stars
4.5 out of 5
2,474 global ratings

Customers say

Customers like the appearance, performance, and quality of the aquarium pond water treatment. For example, they mention that it looks good, the plants look greener, and has a wonderful color to their leaves. Some say that it helps to halt some plant death and that it promotes root growth.

AI-generated from the text of customer reviews

110 customers mention102 positive8 negative

Customers say the aquarium pond water treatment helps their plants grow better and increase in health. They say it promotes root growth and works wonders on hardy plants.

"...Algae is gone and plants grow like crazy. It does not harm fish or snails." Read more

"...I use this almost strictly as an algae preventative and it works amazingly!! I dose every morning when I first turn on the lights for the day...." Read more

"The API CO2 Booster works great. I use it to fight Black Bear or Black Brush Algae (BBA). But, it works well for your plants...." Read more

"...It does seem to kill off excess algae very quickly while also promoting root growth. So it does seem to do what it says...." Read more

47 customers mention39 positive8 negative

Customers like the quality of the aquarium pond water treatment. They mention that it keeps the plants healthy, helps to halt some plant death, and is good value for money. Some say that the product is effective in cutting down on algae and keeping plants vibrant.

"...looses one star, however I am pretty sure that it has help to halt some plant death, so that is a plus.MY PETS:..." Read more

"...This product keeps my plants vibrant. I use this along with an air pump for optimal results...." Read more

"...It does seem to kill off excess algae very quickly while also promoting root growth. So it does seem to do what it says...." Read more

"...It was highly recommended on YouTube by an aquascaper. It is a convenient source of CO2 without having to get elaborate equipment." Read more

33 customers mention29 positive4 negative

Customers like the performance of the aquarium pond water treatment. They say it works great for the price, is a good purchase, and is able to make aquarium plants look healthier and greener.

"I shop this vendor often. Always really great prices. Highly recceomend." Read more

"Cheaper than Flourish Excel and it does the same thing. Beware, this can potentially harm your fish and may even harm some plants...." Read more

"API CO2 Booster is less expensive and works just as well as Excel. I've noticed a significant improvement in the growth rate of various plants...." Read more

"The API brand is more economical and the contents last longer than Flourish Excel, which is not exactly the same product, but used for the same..." Read more

13 customers mention13 positive0 negative

Customers are satisfied with the appearance of the aquarium pond water treatment. They mention that their plants look good, greener, and lush, with a wonderful color to their leaves.

"My tanks look great after using this for a week or two! I use almost every other day, or on the weekends when I do my water changes...." Read more

"...cause I’m lazy and I love how fast it seems to work and improve the look of my plants. I wish I felt safe using it at higher doses...." Read more

"Plants are looking better after using this for the past 5 days in my aquarium" Read more

"...I will say my plants look good...." Read more

7 customers mention3 positive4 negative

Customers are mixed about the safety of the aquarium pond water treatment. Some mention that it's very safe to use and does not harm fish or snails, while others say that it can potentially harm your fish and may even harm some plants. Some customers also say that the product is dangerous and has killed several of their snails.

"...However after using the products, 4 of my snails were killed and my fish had stayed at the bottom of the tank...." Read more

"...Algae is gone and plants grow like crazy. It does not harm fish or snails." Read more

"...Beware, this can potentially harm your fish and may even harm some plants...." Read more

"...been something else going on because this product seems to be very safe to use. It works perfectly well and is a great alternative to pressurized CO2." Read more

Great Product
5 Stars
Great Product
I put the recommended dose in my 55 gallon aquarium every day and have no problems. Algae is gone and plants grow like crazy. It does not harm fish or snails.
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Top reviews from the United States

Reviewed in the United States on February 29, 2024
Size: 16 ozColor: BrownVerified Purchase
Customer image
KEC
5.0 out of 5 stars Great Product
Reviewed in the United States on February 29, 2024
I put the recommended dose in my 55 gallon aquarium every day and have no problems. Algae is gone and plants grow like crazy. It does not harm fish or snails.
Images in this review
Customer image
Customer image
Reviewed in the United States on March 19, 2024
Size: 16 ozColor: BrownVerified Purchase
Reviewed in the United States on February 3, 2018
Size: 16 ozColor: BrownVerified Purchase
Customer image
4.0 out of 5 stars Amazing for Preventing Algae
Reviewed in the United States on February 3, 2018
ALGAE PREVENTATIVE:
I use this almost strictly as an algae preventative and it works amazingly!! I dose every morning when I first turn on the lights for the day. I have been told that the beginning of the "photo" (light) period is the best time to use CO2 for your plants and to keep your fish safe. The measuring cap is really made for tanks at least 10 gallon and above, so I poured some of my CO2 booster into a clean glass dropper bottle and made a label for how to measure it in drops instead of ML for 1 gallon snail tank and my 5 gallon pea puffer tank.

PLANT GROWTH:
Meh - I haven't really seen significant gains, so this product looses one star, however I am pretty sure that it has help to halt some plant death, so that is a plus.

MY PETS:
They're fine with it. My fish and snails have not reacted adversely to this at all (even when I added a few extra drops to see if there was a change in their behavior).
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Customer imageCustomer image
8 people found this helpful
Report
Reviewed in the United States on December 31, 2023
Size: 16 ozColor: BrownVerified Purchase
Reviewed in the United States on December 6, 2023
Size: 16 ozColor: BrownVerified Purchase
Reviewed in the United States on March 2, 2016
Size: 16 ozColor: BrownVerified Purchase
8 people found this helpful
Report
Reviewed in the United States on November 9, 2022
Size: 16 ozColor: BrownVerified Purchase
Customer image
3.0 out of 5 stars Yes and no
Reviewed in the United States on November 9, 2022
After purchasing this product I told people in a Facebook group that I was going to add this product to my tank care and they gave me a lot of strong warnings not to use it, that it was toxic, and that it could kill my fish.

I didn’t have any snails and algae was getting out of control, so I went ahead and tried it at a very low dose. They were talking about dosing at the recommended levels like most people would. I’ve been using it in syringe and only about 1/10 the recommended dose, only when algae starts getting out of control. It does seem to kill off excess algae very quickly while also promoting root growth. So it does seem to do what it says. Even when I just use a tiny amount, my plants always have tons of additional roots within 24 hours. I hope it‘s not doing any long term damage to my lovely fish in this super low dose, cause I’m lazy and I love how fast it seems to work and improve the look of my plants. I wish I felt safe using it at higher doses. I would love to see what it could really do.

I’m using only 5 drops which is 1/10 of a milliliter, in a 5 gallon tank. It’s pretty impressive. I don’t use it daily or weekly, only when I see an issue starting. I purchased some snails, which it is supposedly bad for, but they are still alive at that dose. And it only decreases the algae mildly at that dose, so they still have enough to eat. Personally, I would rather use this than snails to control algae since they threw off my tank parameters more than this product does.

Even in my tiny 2.5 gallon tank it only takes a few drops of this stuff to quickly control excess algae growth. I would advise people to start at a very low dose like I did.

At any rate, so far it seems to work, even at very low doses. I only gave it 3 stars because people who know more than I do about fish care warned me so adamantly against using this product in particular, at the suggested doses on the bottle.
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13 people found this helpful
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Reviewed in the United States on June 18, 2023
Size: 16 ozColor: BrownVerified Purchase
2 people found this helpful
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Top reviews from other countries

Sawyer
5.0 out of 5 stars Works
Reviewed in Canada on January 13, 2024
Size: 16 ozColor: BrownVerified Purchase
G K Sukumar
5.0 out of 5 stars Awesome Product
Reviewed in India on February 8, 2023
Size: 16 ozColor: BrownVerified Purchase
Sarah
5.0 out of 5 stars Cleared up my aquarium really well
Reviewed in Canada on October 18, 2022
Size: 16 ozColor: BrownVerified Purchase
3 people found this helpful
Report
Clayto
5.0 out of 5 stars Great stuff
Reviewed in the United Kingdom on February 5, 2024
Size: 16 ozColor: BrownVerified Purchase
One person found this helpful
Report
Ajar N.
5.0 out of 5 stars Not harming my fishes
Reviewed in India on March 16, 2019
Size: 16 ozColor: BrownVerified Purchase