Co2 Diffuser
FailDemand is soft, at -23.7% this quarter, so Co2 Diffuser is a Fail.
- Flapen Score
- 47 / 100Ranks 2,474 of 3,978 Pet Supplies niches · −4 vs the category median of 5147
- Market size
- $84K/yr130K searches / yr
- 90-day growth
- -23.7%search demand this quarter
- Competition
- 48%top-5 click share · 10 brands · 14 sellers
Flapen Score
Co2 Diffuser against its category
The dotted line is the Pet Supplies average. Past it, Co2 Diffuser is stronger. Inside it, weaker.
Market
The Co2 Diffuser market on Amazon at a glance
Shoppers on Amazon United States searched for Co2 Diffuser 130K times last year and spent an estimated $84K. The top 5 brands take 87% of clicks. Demand peaks in Feb. Flapen scores it 47 out of 100, a Fail.
01 · Demand
An estimated 4.3% of those searches ended in a purchase.
Shoppers searched for this 130K times in the last 12 months. That counts every search on Amazon United States for this niche's terms. An estimated 4.3% of those searches ended in a purchase. Searches in the last 90 days moved -23.7% against the 90 days before. Searches, conversion and average price together put the market at an estimated $84K a year.
- Searches, last 12 months
- 130K
- Growth, 90 days vs prior 90
- -23.7%
- Conversion, latest week
- 4.3%
- Market size, estimated
- $84Ka year
- Peak month
- February1.5× the quietest month
- Top search term
- co2 diffuser70K searches a year
02 · Price
A sale here is worth $15.24.
Listings sell for $15.24 on average, from $6.06 to $29.68. Amazon reports units sold in ranges. This niche sold 5K to 6K a year. The average listing sells 100 to 250 of them. At $15.24 that is $2K to $4K a year per listing.
- Average price
- $15.24inside the $15 to $100 sweet spot
- Price range
- $6.06–$29.68
- Amazon United States median price
- $24.38across 115,062 niches
- Units sold a year
- 5K–6K
- Units per listing a year
- 100–250
- Revenue per listing a year
- $2K–$4K
- Returns
- 2.9%of orders · Amazon United States median 2.1%
03 · Entry bar
The bar here is low.
79% of listings pay for placement with sponsored ads. 93% ship with Prime. On an average day, 8.1% of listings are out of stock. The average listing ranks #197 within Fish & Aquatic Pets. It carries 340 reviews at 4.21 stars, so a new listing needs social proof before a better product.
- Sponsored listings
- 79%
- Prime listings
- 93%
- Out of stock, average day
- 8.1%
- Average rank
- #197in Fish & Aquatic Pets
- Average rating
- 4.21 starsAmazon United States average 4.42 stars
- Average reviews
- 340per listing
- Listings tracked
- 29
04 · Newcomers
0 of last year's 4 launches cleared the first-year sales bar.
4 products launched here in the last 12 months. 0 of them cleared the first-year sales bar, our mark for a successful launch. The brands on the shelf have sold for 62 months on average, so the names here are established.
- Launched, last 12 months
- 4
- Successful launches
- 0Amazon's first-year sales bar
- Average brand age
- 62 months
Products
Top Co2 Diffuser products & what they sell for
The products selling here, as shoppers see them on Amazon. Shelf share and sales are our estimates.
Prices and ratings read from Amazon on Jul 17, 2026. The live listing can differ.
Top sellers
by estimated 90-day click share
Fzone Neo CO2 Diffuser with Customized Ceramic from South Korea(S-13mm)
- Price
- $14.16
- Rating
- 4.2/5
- Reviews
- 1,026
- Age
- 4y ago

Clscea Aquarium Stainless Steel CO2 Diffuser Atomizer with Integrated Check Valve for Rimless Tanks DC300-20
- Price
- $18.77
- Rating
- 4.3/5
- Reviews
- 336
- Age
- 5y ago

Clscea CO2 Diffuser for Aquarium Plant Mini CO2 Atomizer U-Shaped-S
- Price
- $10.65
- Rating
- 4.0/5
- Reviews
- 104
- Age
- 1y ago

Yagote Glass CO2 Reactor 3 Spiro Glass Diffuser for Aquarium Plants Suitable for Tanks 15-200 Gal/60-757 Liter
- Price
- $9.95
- Rating
- 3.8/5
- Reviews
- 634
- Age
- 9y ago

Pawfly CO2 Diffuser for Aquarium Plants Clear Acrylic CO2 Atomizer Aquarium CO2 Diffuser with Ceramic Disc Bubble Counter and Suction Cup
- Price
- $10.28
- Rating
- 3.8/5
- Reviews
- 88
- Age
- 1y ago
Trending
estimated 90-day click momentum
FZONE Acrylic Aquarium CO Diffuser with Built-in Check Valve & Bubble Counter Syringe & Suction Cup Fine Bubble CO Delivery for Planted Tanks (L-33mm)
- Price
- $14.86
- Rating
- 4.4/5
- Reviews
- 24
- Age
- 4mo ago

FZONE Acrylic Aquarium CO Diffuser with Built-in Check Valve & Bubble Counter Syringe & Suction Cup Fine Bubble CO Delivery for Planted Tanks (M-25mm)
- Price
- $12.65
- Rating
- 4.4/5
- Reviews
- 24
- Age
- 5mo ago

FZONE Acrylic Aquarium CO Diffuser with Built-in Check Valve & Bubble Counter Syringe & Suction Cup Fine Bubble CO Delivery for Planted Tanks (S-19mm)
- Price
- $11.95
- Rating
- 4.4/5
- Reviews
- 24
- Age
- 5mo ago

Clscea CO2 Diffuser for Aquarium Plant Mini CO2 Atomizer U-Shaped-S
- Price
- $10.65
- Rating
- 4.0/5
- Reviews
- 104
- Age
- 1y ago

Clscea Aquarium Stainless Steel CO2 Diffuser Widen Hook DCW300-40
- Price
- $26.55
- Rating
- 4.3/5
- Reviews
- 336
- Age
- 5y ago
Newest
by launch date
FZONE Acrylic Aquarium CO Diffuser with Built-in Check Valve & Bubble Counter Syringe & Suction Cup Fine Bubble CO Delivery for Planted Tanks (L-33mm)
- Price
- $14.86
- Rating
- 4.4/5
- Reviews
- 24
- Age
- 4mo ago

FZONE Acrylic Aquarium CO Diffuser with Built-in Check Valve & Bubble Counter Syringe & Suction Cup Fine Bubble CO Delivery for Planted Tanks (M-25mm)
- Price
- $12.65
- Rating
- 4.4/5
- Reviews
- 24
- Age
- 5mo ago

FZONE Acrylic Aquarium CO Diffuser with Built-in Check Valve & Bubble Counter Syringe & Suction Cup Fine Bubble CO Delivery for Planted Tanks (S-19mm)
- Price
- $11.95
- Rating
- 4.4/5
- Reviews
- 24
- Age
- 5mo ago

FNANJWQ Aquarium Air Stone Disc CO2 Diffuser for Aquarium Plants Fish Tank Nano Bubble Stone Kit Ultra-high Dissolved Bubbler Airstone with Accessories for Fish Tank and Small Bucket
- Price
- $6.06
- Rating
- 4.2/5
- Reviews
- 18
- Age
- 11mo ago

Clscea CO2 Diffuser for Aquarium Plant Mini CO2 Atomizer U-Shaped-S
- Price
- $10.65
- Rating
- 4.0/5
- Reviews
- 104
- Age
- 1y ago
Competition
Competition: brands, sellers & click share
The top 5 products take an estimated 48% of clicks. Leaders hold, but buyers still shop past them.
Brands
10 falling
Sellers
14
Est. top-5 brand share
87%
Top 20: 100%
Est. top-5 click share
48%
Top 20: 90%
Open market
9%
- Clscea36%
- FZONE31%
- Pawfly9%
- Yagote7%
- TWINSTAR5%
- JARDLI4%
- Open — no brand owns it (4 brands, 9%)
Demand
Co2 Diffuser search demand
Weekly searches over the year, seasonality beneath. Pick a range.
Peak months: Feb · busiest ÷ quietest = 1.5×
Search terms
Top Co2 Diffuser search terms shoppers use
The exact words shoppers type, with estimated yearly volume, growth, and conversion.
- co2 diffuser70K/yr
- co2 diffuser aquarium35K/yr
- aquarium co2 diffuser12K/yr
- c02 diffuser5K/yr
- co2 aquarium diffuser4K/yr
- c02 diffuser aquarium4K/yr
Reviews and returns
What reviews say buyers love and hate about Co2 Diffuser
We read the reviews and the return reasons for every product selling here.
“Doesn't work as stated”
Every topic
Every topic buyers talk about, one row each.
Red shows the share of negative reviews and green the share of positive reviews, biggest topic first. Open a row to read what they wrote.
17 topics
Keep looking
Related niches
Niches in the same category that score near this one. Research these next.
Best Flapen score
The highest-scoring niches we track right now, across every category.
FAQ
Common Co2 Diffuser questions
Answered from the same tracked data.
Figures on this page are estimates modeled from public Amazon pages and third-party keyword data. Amazon does not supply them, and no connected seller's data is used. How we handle Amazon data









