Search  for anything...
API

API Co2 Booster Freshwater Aquarium Plant Treatment 8 Fl oz Bottle

  • Based on 0 reviews
Condition: New
Checking for the best price...
$10.58 Why this price?

Buy Now, Pay Later

As low as $2 / mo
  • – 4-month term
  • – No impact on credit
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Apple Pay, and PayTomorrow. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

FREE refund/replacement until Jan 31, 2026

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: In Stock.
Fulfilled by Amazon
Arrives Sunday, Feb 1
Order within 6 hours and 19 minutes
Available payment plans shown during checkout
Protection Plan Protect Your Purchase
Checking for protection plans...

Recently Viewed

Color: Black


Size: 8 oz


Style: Aquarium Treatment


Features

  • Contains one (1) API CO2 BOOSTER Freshwater Aquarium Plant Treatment 8 fl 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

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 to control algae, promote healthy bacterial growth and help control and cure fish diseases and 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.

Brand: API


Liquid Volume: 237 Milliliters


Item Weight: 0.01 Ounces


Item Form: Liquid


Manufacturer: Mars Fishcare


Is Discontinued By Manufacturer ‏ : ‎ No


Product Dimensions ‏ : ‎ 2 x 2 x 8 inches; 0.01 ounces


Item model number ‏ : ‎ 579C


Date First Available ‏ : ‎ December 21, 2010


Manufacturer ‏ : ‎ Mars Fishcare


Best Sellers Rank: #8,635 in Pet Supplies (See Top 100 in Pet Supplies) #50 in Aquarium Water Treatments


#50 in Aquarium Water Treatments:


Customer Reviews: 4.6 4.6 out of 5 stars (4,832)


Item Weight: 0.01 ounces


Manufacturer: Mars Fishcare


Item model number: 579C


Date First Available: December 21, 2010


Item Package Dimensions L x W x H: 7.64 x 1.73 x 1.65 inches


Item Dimensions LxWxH: 2 x 2 x 8 inches


Item Weight: 0.01 Ounces


Brand Name: API


Target Audience Keyword: dogs, fish, fish;algae-eaters; betta-fish; bottom-feeder-fish; cichlid-fish; goldfish; invertebrate-fish; mollusks; octopuses; rays; sharks; snails


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.


Country of Origin: United States


Model Name: CO2 BOOSTER 8 OZ


Color: Black


Size: 8 oz


Material: cotton


Number of Items: 1


Style: Aquarium Treatment


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sunday, Feb 1

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Daily use in Planted tanks.
Color: Black Size: 8 oz Style: Aquarium Treatment
Review Image by Kindle Customer Kindle Customer
Using in a freshwater planted tank, our plants have never looked better. The plants are producing off shoots and the fish are doing fantastic. We use this CO2 daily on our fish aquariums!! When delivered cold The plastic did crack due to me dropping the bottle. I was able to save the contents of the bottle in the last bottle I bought meaning I buy this often. The size of the bottle is 8 ounces, fits under the tanks on the shelves well. ... show more
Reviewed in the United States on November 6, 2025 by Kindle Customer Kindle Customer
    • This stuff really works
Color: Brown Size: 16 oz Style: Aquarium Treatment
Review Image by Girl w/No Name Girl w/No Name
Review Image by Girl w/No Name Girl w/No Name
Review Image by Girl w/No Name Girl w/No Name
This booster definitely works well for aquarium plants. It's not so good for snails and shrimp. If I put slightly more than the recommended dosage it kills off pest snails and my Nerite snails and Ghost shrimp! So follow the dosage instructions. The plants do very well.
Reviewed in the United States on November 4, 2025 by Girl w/No Name Girl w/No Name
    • Works!
Color: Black Size: 8 oz Style: Aquarium Treatment
I had a bad algae problem in my planted shrimp tank with this nasty stringy algae. I’ve been putting this liquid in every morning and all of the algae is gone!! The tank looks so clean and healthy and all of my shrimp and little fish are doing well. Great product!
Reviewed in the United States on August 1, 2025 by Rebekah
    • HO2, para acuarios.
Color: Brown Size: 16 oz Style: Aquarium Treatment
Aun no he visto los resultados, muy pocos días, hay que esperar.
Reviewed in the United States on August 13, 2025 by enrique plasencia
    • Relief from algae!
Color: Brown Size: 16 oz Style: Aquarium Treatment
I have a 20 gal acrylic. Algae is fierce and very aggressive, needs to be killed or it will smother and kill plants! I’ve been comparing C02 Booster to Flourish Excel over the last 2 weeks. Flourish Excel is working a little better. I have a lot of BBA and brown algae. More new leaf growth triggered and noticeably more algae dying with Excel vs. Booster. I will continue to dose Flourish Excel daily. ... show more
Reviewed in the United States on June 22, 2025 by Marc H.
    • API CO2 Booster! Question
Review Image by Muraki TTM Muraki TTM
Review Image by Muraki TTM Muraki TTM
The media could not be loaded. API CO2 booster! Question I bought the API CO2 Booster as well as the Sera CO2 start. Before commenting on API, let's talk about Sera. Using CO2 drop checker, we can measure Sera co2 start from blue to green, but the dosage used is different from that of the manufacturer, so we need to use 2-3 tablets, and the water is 40-60L! Because this week, my moss grows rapidly from withered and yellow! Yes, pay attention to the picture of Moss, because I have not injected carbon dioxide since I bought Moss, so it leads to a large area of Moss withered and yellow, and there is no sign of growth at all! I do have a diy co2 device, but I don't want to use it and want to compare it with other types of CO2! Therefore, Moss faced death, and now it can be seen that Moss, who is withered and yellow, has grown again! It's Api CO2 Booster! Is it carbon dioxide? Can say yes, can say no! But it is not and incorrect, because glutaraldehyde can be biodecomposed in the environment, and the product does not contain halogen, and the decomposed product is carbon dioxide! Just like other aquatic plants, it is organic carbon liquid, and you can't detect any changes using CO2 drop checker! Therefore, we must pay attention to the use and use the dose carefully. If you doubt the efficacy and increase the excess dose, it will brake the fish, but algae removal has a certain effect! Individuals can take oxygen to avoid insufficient dissolved oxygen! I just started test today, and I believe it will take some time before I can make substantive and effective remarks, but it should be noted that it is an organic carbon liquid and a nutrient needed by plants. Therefore, it will take me some time to make a comment! How effective is it? Can it be like Sera CO2 start? But I will give five-star praise, and I believe it will bring me surprises! Update: 22-09-22 It's been 4 days, the same 40-60L water, 10ml dose is put into drought, and when you go home late to turn on the lights, you also use a carbon dioxide detector, but the light is only 4 hours, so you are afraid of growing moss and love moss, but not algae! I occasionally wipe off some, but not completely, because of the fish tank health index! Three days early did not feel the situation, to this morning saw the detector green, the reason is 21-09 night home to turn on the lights, after forget to turn off the lights! It was not until I got up this morning that I looked at the fish tank, changed water and fed, and found that the detector turned blue to green! The lights have been turned on for more than 8 hours! Let's estimate it like this! The daily dose of 10ml, change the water and clean the next day, and the dose put in earlier may remain in the fish tank under the condition of insufficient light, maybe not! Personally, I think API CO2 booster is effective. However, it is best not to use the dosage according to the instructions, but according to the size of your fish tank, the number of aquatic plants and the water capacity! You must observe for yourself, how many doses you put in, and how long you illuminate! But the last thing to mention is that oxygen must be given! Personal practice: Put in the dose early, let the aquatic plants absorb it, and turn on the light at night! Will glutaraldehyde deprive the fish tank of oxygen? Therefore, I use dissolved oxygen device to increase dissolved oxygen! And everyone's fish tank, in practice, will be different! Observe for yourself. ... show more
Reviewed in the United States on September 18, 2022 by Muraki TTM Muraki TTM
    • Amazing product
Color: Black Size: 8 oz Style: Aquarium Treatment
Review Image by Roly E Roly E
Review Image by Roly E Roly E
Review Image by Roly E Roly E
The media could not be loaded. This product is a must buy, I’ve had this new aquarium for a month and the growth of the Eleocharis is remarkable. My aquarium is about 6 gal and every morning I drop 6-8 drops in it. Something amazing is that I haven’t done water changes and it has remained algae free, except for the biofilm that forms on the surface. It is definitely a great product if you do not have co2 injection. I bought the small bottle because the product expires in about a year, but this doesn't matter because it's definitely worth the money. ... show more
Reviewed in the United States on February 21, 2025 by Roly E Roly E
    • Yes and no
Color: Brown Size: 16 oz Style: Aquarium Treatment
Review Image by Amazon Customer Amazon Customer
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. ... show more
Reviewed in the United States on November 9, 2022 by Amazon Customer Amazon Customer

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...