aquarium sponge
Worth a lookShows a sweet-spot price point ($37.43 avg), but brand-locked demand (top 5 brands take 94% of clicks) keeps it on the watch list.
Avg price
Incredible$37.43avg listing price — sweet spot $15–$100
Returns
Great1.1%return rate — above 6% kills the launch gate
Review moat
Good920.15avg incumbent reviews — the moat a new listing must climb
Quality gap
Good4.4★avg incumbent rating — lower means beatable quality
Price range
Good$2.56–$139.41cheapest to priciest tracked listing — scored on the share inside $15–$100
Conversion
Good4.5%search→purchase rate — share of searches ending in a sale
Market size
Good$318K$318K/yr · 186K searches
Growth
Good+22.6%90-day search growth — must beat 0% to launch
Competition
Okay59%top-5 click share — leaders hold, buyers still browse
Brand share
Bad94%top-5 brand share — brand-locked demand
According to Flapen's Amazon United States niche tracking, aquarium sponge is a $318K/yr Amazon United States market (186K searches/yr). The top 5 brands hold 94% of demand. Demand peaks in May–Jun. Verdict: Worth a look — 55/100.
Data updated Jul 17, 2026 · scored weekly · How we score niches
aquarium sponge market data
- Units sold / yr
- 8K–10K
- avg 250–500/product
- Revenue / yr
- $299K–$374K
- units × avg price
- Launch success
- —
- 0 of 0 new (360d)
- Conversion rate
- 4.5%
- Avg BSR
- #107
- Page quality
- 0%
- Prime
- 95%
- Sponsored
- 75%
- Out of stock
- 0.3%
- Avg brand age
- 49 months
- Avg seller age
- 175 days
Competition & brand share
The top 5 products take 59% of clicks — established leaders, but buyers still shop beyond them.Brands
8 falling
Sellers
21
Top-5 brand share
94%
Top 20: 100%
Top-5 click share
59%
Top 20: 100%
Open market
4%
- ALEGI42%
- GUTTERSTUFF23%
- AQUANEAT20%
- Pawfly7%
- Borlech3%
- koxuyim2%
- Open — no brand owns it (2 brands, 4%)
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — +22.6% search growth over the last 90 days.Peak months: May, Jun · busiest ÷ quietest = 1.7×
Top aquarium sponge search terms
- aquarium sponge33K/yr
- gutter foam23K/yr
- filter foam20K/yr
- aquarium foam20K/yr
- matala filter media pads9K/yr
- aquarium filter foam13K/yr
- matala7K/yr
- foam filter10K/yr
- foam gutter inserts4K/yr
- gutter foam inserts7K/yr
Top aquarium sponge products on Amazon
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
All 20 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
ALEGI Aquarium Sponge Filter Pad Bio Filter Media Foam Sponges Cut-to-Size Foam for Fish Tank (20x20x1 (20PPI))
ALEGI$9.034.7★1,939 rev
AQUANEAT 2 Pack Aquarium Bio Sponge Filter Media Pad Cut-to-Size Open Cell Foam Sheet for Fish Tank Sump (9 x 9 x 0.5) Black
AQUANEAT$6.074.6★370 rev
Pawfly 4 Pack Aquarium Bio Sponge Filter Media Pad Filter Foam Sponge Pads Cut-to-Size Foam for Fish Tank Filters Sumps Ponds Hydroponics 6.3 x 5.5 x 0.78
Pawfly$6.014.5★281 rev
GutterStuff Original Gutter Guard - 4-Inch K Style Foam Gutter Filter Insert with Year Round Leaf Protection & Easy DIY Installation - GSK432-2
GUTTERSTUFF$64.104.1★794 rev
Pro Gutter Guard - 5-Inch K Style Foam Gutter Filter Insert with Year Round Leaf Protection & Easy DIY Installation - GSK532-3
GUTTERSTUFF$109.293.9★98 rev
Newest
by launch date
Borlech Aquarium Bio Filter Sponge Pad - Cut-to-Size Aquarium Filter Media for Fish Tank Pond Sump - Mechanical & Biological Filtration (18.5x18.5x0.8 20PPI 1 Pack)
Borlech$8.52773 rev
Pawfly 4 Pack Aquarium Bio Sponge Filter Media Pad Filter Foam Sponge Pads Cut-to-Size Foam for Fish Tank Filters Sumps Ponds Hydroponics 6.3 x 5.5 x 0.78
Pawfly$6.01281 rev
ALEGI Aquarium Sponge Filter Pad Bio Filter Media Foam Sponges Cut-to-Size Foam for Fish Tank (20x20x1 (20PPI))
ALEGI$9.031,939 rev
ALEGI Aquarium Sponge Filter Pad Bio Filter Media Foam Sponges Cut-to-Size Foam for Fish Tank (20x20x1 (50PPI))
ALEGI$8.971,939 rev
ALEGI Aquarium Sponge Filter Pad Bio Filter Media Foam Sponges Cut-to-Size Foam for Fish Tank (20x20x1 (35PPI))
ALEGI$9.021,939 rev
Trending
90-day click momentumPro Gutter Guard - 5-Inch K Style Foam Gutter Filter Insert with Year Round Leaf Protection & Easy DIY Installation - GSK532-3
GUTTERSTUFF$109.293.9★
GutterStuff Original Gutter Guard - 6-Inch K Style Foam Gutter Filter Insert with Year Round Leaf Protection & Easy DIY Installation - GSK632-2
GUTTERSTUFF$100.314.1★
GutterStuff Original Gutter Guard - 4-Inch K Style Foam Gutter Filter Insert with Year Round Leaf Protection & Easy DIY Installation - GSK432-2
GUTTERSTUFF$64.104.1★
GutterStuff Original Gutter Guard - 5-Inch Half Round Foam Gutter Filter Insert with Year Round Leaf Protection & Easy DIY Installation - GSR532-2
GUTTERSTUFF$64.493.9★
GutterStuff EZ Gutter Guard - 5-Inch K Style Foam Gutter Filter Insert with Year Round Leaf Protection & Easy DIY Installation - GSK532-1
GUTTERSTUFF$62.803.7★
What buyers say about aquarium sponge
What buyers praise and complain about, mined from review topics.What buyers love
“This filter works great”
“great value for the money”
“Fits good”
“Other than that, no complaints”
“exactly what I was looking for”
“It keeps the tank clean”
“durability good”
“easy to use”
“It's the right thickness”
“Easy to Install”
What buyers complain about
“as you can see in my photo it was far too short”
“Poor quality”
“1 filter missing”
“Not one inch thick”
“They are more expensive than basic filter pads”
“This stuff does not work”
“basically doesn't allow any water to get through”
“had to be soaked prior to use”
“Dirty, dirty, dirty”
“Way too rough”
Top return reasons
Common questions
- Is aquarium sponge profitable to sell on Amazon United States?
- The niche generates $318K/yr across 20 tracked products. 90-day search growth is +22.6%. Flapen's verdict: Worth a look (55/100).
- How competitive is the aquarium sponge niche?
- 8 brands and 21 sellers compete. The top 5 products take 59% of clicks and top 5 brands hold 94% of demand.
- What do buyers complain about in aquarium sponge?
- Top complaints mined from reviews: Size-Overall, Quality-Overall, Filtration. The return rate is 1.1%.
- When does demand for aquarium sponge peak?
- Demand peaks in May–Jun; the busiest month runs 1.7× the quietest.
- What does it cost to enter the aquarium sponge niche?
- Listings span $2.56–$139.41; the average listing price is $37.43 (sweet spot $15–$100). The average incumbent carries 920 reviews — the moat a new listing must climb.