aquarium filter sponge
Skip itSoft demand (-6.1% this quarter) — this niche doesn't clear our bar today.
Returns
Great1.2%return rate — above 6% kills the launch gate
Conversion
Good6.9%search→purchase rate — share of searches ending in a sale
Review moat
Okay1,535.5avg incumbent reviews — the moat a new listing must climb
Quality gap
Okay4.5★avg incumbent rating — lower means beatable quality
Price range
Okay$4.24–$21.80cheapest to priciest tracked listing — scored on the share inside $15–$100
Competition
Okay64%top-5 click share — leaders hold, buyers still browse
Market size
Okay$116K$116K/yr · 195K searches
Brand share
Okay90%top-5 brand share — brands hold most of the demand
Avg price
Bad$8.55avg listing price — sweet spot $15–$100
Growth
Bad-6.1%90-day search growth — must beat 0% to launch
According to Flapen's Amazon United States niche tracking, aquarium filter sponge is a $116K/yr Amazon United States market (195K searches/yr). The top 5 brands hold 90% of demand. Demand peaks in May. Verdict: Skip it — 41/100.
Data updated Jul 17, 2026 · scored weekly · How we score niches
aquarium filter sponge market data
- Units sold / yr
- 13K–15K
- avg 500–750/product
- Revenue / yr
- $107K–$128K
- units × avg price
- Launch success
- —
- 0 of 1 new (360d)
- Conversion rate
- 6.9%
- Avg BSR
- #122
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 100%
- Out of stock
- 0.0%
- Avg brand age
- 40 months
- Avg seller age
- 167 days
Competition & brand share
The top 5 products take 64% of clicks — established leaders, but buyers still shop beyond them.Brands
9 falling
Sellers
19
Top-5 brand share
90%
Top 20: 100%
Top-5 click share
64%
Top 20: 100%
Open market
7%
- AQUANEAT59%
- ALEGI17%
- Pawfly5%
- Fluval5%
- HUYAYA4%
- Borlech3%
- Open — no brand owns it (3 brands, 7%)
Demand & seasonality
Weekly Amazon search volume, last 57 weeks — -6.1% search growth over the last 90 days.Peak months: May · busiest ÷ quietest = 1.8×
Top aquarium filter sponge search terms
- aquarium filter sponge63K/yr
- filter sponge26K/yr
- pre filter sponge18K/yr
- fish tank filter sponge14K/yr
- prefilter sponge10K/yr
- filter sponges fish tank14K/yr
- fish filter sponge9K/yr
- pre filter sponge aquarium7K/yr
- aquarium prefilter sponge5K/yr
- prefilter sponge for aquarium8K/yr
Top aquarium filter 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
AQUANEAT 6-Pack Pre-Filter Sponge for Aquarium Shrimp Fry Fish Tank Filter 0.8 Intake Replacement Foam Cover
AQUANEAT$6.054.5★2,192 rev
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
Fluval Edge Pre-Filter Sponge Replacement Aquarium Filter Media A1387
Fluval$4.244.6★4,925 rev
AQUANEAT 6-Pack Replacement Filter Sponge Pads Aquarium Foam Insert Compatible with AquaClear 50 Fish Tank Filter Media
AQUANEAT$6.374.4★271 rev
Newest
by launch date
AQUANEAT Aquarium Filter Sponge 8-Layer Filter Media Pad Cut-to-Size Foam Floss for Fish Tank Sump Pond (16 x 12 x 0.6)
AQUANEAT$5.7379 rev
hygger Aquarium Sponge Filter Pad Filter Media Foam Sponges Cut-to-Size Open Cell Foam Sheet for Fish Tanks and Ponds S (4 Pack 5.9 * 3.9 * 1 inch)
hygger$9.3172 rev
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
AQUANEAT 6-Pack Replacement Filter Sponge Pads Aquarium Foam Insert Compatible with AquaClear 50 Fish Tank Filter Media
AQUANEAT$6.37271 rev
Borlech 8-Layer Fast-Acting Aquarium Filter Pad - Cut-to-Size Aquarium Floss Media for Fish Tank Pond Sump - Fast Water Polishing in Hours (15.75x11.81x0.6 1 Pack)
Borlech$7.161,048 rev
Trending
90-day click momentumAQUANEAT Aquarium Filter Sponge 8-Layer Filter Media Pad Cut-to-Size Foam Floss for Fish Tank Sump Pond (16 x 12 x 0.6)
AQUANEAT$5.734.4★
AQUANEAT 6-Pack Pre-Filter Sponge for Aquarium Shrimp Fry Fish Tank Filter 1 Intake Replacement Foam Cover
AQUANEAT$14.844.5★
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★
AQUANEAT 12-Pack Pre-Filter Sponge for Aquarium Shrimp Fry Fish Tank Filter Intake 0.6 Inch Replacement Foam Cover
AQUANEAT$7.864.5★
ALEGI Aquarium Sponge Filter Pad Bio Filter Media Foam Sponges Cut-to-Size Foam for Fish Tank (20x20x1 (20PPI))
ALEGI$9.034.7★
What buyers say about aquarium filter sponge
What buyers praise and complain about, mined from review topics.What buyers love
“Filter is good quality”
“fits like a glove”
“I think they are well made”
“Good deal”
“It keeps the tank clean”
“Just what I needed”
“Holds Up Well”
“Very easy to use”
“Great Product for Clearer Water”
“Worked great to slow the water flow on the aquarium pump”
What buyers complain about
“Material is too thin”
“Too small”
“Filter dimensions inaccurate”
“Not as advertised”
“its lower quality”
“Too expensive”
“Does not work”
“Way too thin”
“Terrible was destroyed in 1 day”
“cheaper material”
Top return reasons
Common questions
- Is aquarium filter sponge profitable to sell on Amazon United States?
- The niche generates $116K/yr across 20 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is -6.1%. Flapen's verdict: Skip it (41/100).
- How competitive is the aquarium filter sponge niche?
- 9 brands and 19 sellers compete. The top 5 products take 64% of clicks and top 5 brands hold 90% of demand.
- What do buyers complain about in aquarium filter sponge?
- Top complaints mined from reviews: Thickness, Size-Overall, Filtration. The return rate is 1.2%.
- When does demand for aquarium filter sponge peak?
- Demand peaks in May; the busiest month runs 1.8× the quietest.
- What does it cost to enter the aquarium filter sponge niche?
- Listings span $4.24–$21.80; the average listing price is $8.55 (sweet spot $15–$100). The average incumbent carries 1,536 reviews — the moat a new listing must climb.