10 gallon fish tank filter cartridges
Skip itBrand-locked demand (top 5 brands take 94% of clicks) — this niche doesn't clear our bar today.
Conversion
Incredible13.7%search→purchase rate — share of searches ending in a sale
Returns
Great1.9%return rate — above 6% kills the launch gate
Avg price
Good$14.29avg listing price — sweet spot $15–$100
Price range
Okay$6.37–$22.54cheapest to priciest tracked listing — scored on the share inside $15–$100
Quality gap
Okay4.5★avg incumbent rating — lower means beatable quality
Growth
Okay+3.2%90-day search growth — must beat 0% to launch
Market size
Okay$104K$104K/yr · 53K searches
Review moat
Bad12,594.42avg incumbent reviews — the moat a new listing must climb
Competition
Bad77%top-5 click share — a locked-up shelf
Brand share
Bad94%top-5 brand share — brand-locked demand
According to Flapen's Amazon United States niche tracking, 10 gallon fish tank filter cartridges is a $104K/yr Amazon United States market (53K searches/yr). The top 5 brands hold 94% of demand. Demand peaks in Sep. Verdict: Skip it — 40/100.
Data updated Jul 17, 2026 · scored weekly · How we score niches
10 gallon fish tank filter cartridges market data
- Units sold / yr
- 6K–8K
- avg 500–750/product
- Revenue / yr
- $86K–$114K
- units × avg price
- Launch success
- —
- 0 of 1 new (360d)
- Conversion rate
- 13.7%
- Avg BSR
- #43
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 75%
- Out of stock
- 0.5%
- Avg brand age
- 50 months
- Avg seller age
- 156 days
Competition & brand share
The top 5 products capture 77% of clicks — a locked-up shelf that new listings rarely crack.Brands
7 rising
Sellers
41
Top-5 brand share
94%
Top 20: 100%
Top-5 click share
77%
Top 20: 100%
Open market
2%
- Tetra72%
- xbbwmrs10%
- Chyodi5%
- Aqueon4%
- HiTauing3%
- Esctabalt3%
- Open — no brand owns it (1 brand, 2%)
Demand & seasonality
Weekly Amazon search volume, last 93 weeks — +3.2% search growth over the last 90 days.Peak months: Sep · busiest ÷ quietest = 2.3×
Top 10 gallon fish tank filter cartridges search terms
- tetra whisper filter medium7K/yr
- tetra medium filter cartridges6K/yr
- whisper bio bag filter cartridges medium6K/yr
- medium fish tank filter6K/yr
- fish tank filter replacement pads5K/yr
- 5 gallon fish tank filter cartridge4K/yr
- medium filter cartridges for aquarium4K/yr
- medium fish tank filter cartridges4K/yr
- tetra whisper 10 filter3K/yr
- filter cartridge replacement4K/yr
Top 10 gallon fish tank filter cartridges 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 12 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Tetra Whisper Bio-Bag Medium Filter Cartridges for Aquariums 3 Count Ready to Use Fits Tetra Whisper Fish Tank Filters 5-10 Gal PF-10 IQ 10
Tetra$6.374.7★28,155 rev
Tetra Whisper Bio-Bag Medium Filter Cartridges for Aquariums 12 Count Unassembled Fits Tetra Whisper Fish Tank Filters 5-10 Gal PF-10 IQ 10
Tetra$7.794.7★28,155 rev
xbbwmrs 8 Count Medium Filter Cartridges Compatible with Tetra Whisper Bio-Bag Filters Medium Replacement Filter Cartridges for Whisper ReptoFilter and 10i IQ10 PF10 Power Filters -Ready to Use
xbbwmrs$19.954.7★553 rev
Tetra Whisper Bio-Bag Medium Filter Cartridges for Aquariums 6 Count Unassembled Fits Tetra Whisper Fish Tank Filters 5-10 Gal PF-10 IQ 10
Tetra$9.284.7★28,155 rev
Tetra Whisper Bio-Bag Large Filter Cartridges for Aquariums 12 Count Unassembled Fits Tetra Whisper Fish Tank Filters 10-30 Gal 20-40 Gal PF-20 30 40 60 IQ 20 30 45 60
Tetra$13.894.7★16,692 rev
Newest
by launch date
Chyodi 16 Pack Medium Filter Cartridges Compatible with Tetra Whisper Bio-Bag Filters Medium for Whisper 10i/IQ10/PF10 and Repto Filter 90 GPH for Medium Aquarium Filter Cartridge
Chyodi$22.25130 rev
Esctabalt 16 Count Medium Filter Cartridges Compatible with Whisper Bio Bag Filters Large Aquarium Filter Cartridge for Whisper 10i/IQ10/PF10 and Repto Filter 90 GPH
Esctabalt$22.54244 rev
xbbwmrs 8 Count Medium Filter Cartridges Compatible with Tetra Whisper Bio-Bag Filters Medium Replacement Filter Cartridges for Whisper ReptoFilter and 10i IQ10 PF10 Power Filters -Ready to Use
xbbwmrs$19.95553 rev
Zuqqony 8 Pack PF-S Filter Cartridges Only Compatible with Silenstream PF10 Power Filters Replacement Aquarium Carbon Cartridge with Zeolite Size 5.5 in L x 3.1 in
Zuqqony$9.281,406 rev
HiTauing 8 Pack EF-S Filter Cartridges for EF-S Element and BF5 BETTAFLO
HiTauing$8.693,205 rev
Trending
90-day click momentumChyodi 16 Pack Medium Filter Cartridges Compatible with Tetra Whisper Bio-Bag Filters Medium for Whisper 10i/IQ10/PF10 and Repto Filter 90 GPH for Medium Aquarium Filter Cartridge
Chyodi$22.254.5★
Tetra Whisper Bio-Bag Large Filter Cartridges for Aquariums 12 Count Unassembled Fits Tetra Whisper Fish Tank Filters 10-30 Gal 20-40 Gal PF-20 30 40 60 IQ 20 30 45 60
Tetra$13.894.7★
Tetra Whisper Bio-Bag Medium Filter Cartridges for Aquariums 6 Count Unassembled Fits Tetra Whisper Fish Tank Filters 5-10 Gal PF-10 IQ 10
Tetra$9.284.7★
HiTauing 8 Pack EF-S Filter Cartridges for EF-S Element and BF5 BETTAFLO
HiTauing$8.694.6★
Tetra Whisper Power Filter 10 Gallons Quiet 3-Stage Aquarium Filtration
Tetra$18.713.9★
What buyers say about 10 gallon fish tank filter cartridges
What buyers praise and complain about, mined from review topics.What buyers love
“Effective filters”
“Worth every penny”
“Zero complaints”
“Just what i needed”
“sizing is accurate”
“Keep my tank clean”
“Easy as pie”
“now they last as much as they description says”
“The water circulates well”
“Tetracycline whisper bio bag”
What buyers complain about
“Worst filter ever”
“Breaks quickly”
“did not perform as well as I expected”
“It doesnt fit the fitter”
“The manufacturer needs to be more diligent with quality control”
“it has a quite significant design flaw that twice caused the unattended tank to lose almost half it's water”
“Assembly required”
“cant adjust the flow”
“Loud and leaky”
“truly didnt even filter the water”
Top return reasons
Common questions
- Is 10 gallon fish tank filter cartridges profitable to sell on Amazon United States?
- The niche generates $104K/yr across 12 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is +3.2%. Flapen's verdict: Skip it (40/100).
- How competitive is the 10 gallon fish tank filter cartridges niche?
- 7 brands and 41 sellers compete. The top 5 products take 77% of clicks and top 5 brands hold 94% of demand.
- What do buyers complain about in 10 gallon fish tank filter cartridges?
- Top complaints mined from reviews: Filtration, Durability, Functionality-Overall. The return rate is 1.9%.
- When does demand for 10 gallon fish tank filter cartridges peak?
- Demand peaks in Sep; the busiest month runs 2.3× the quietest.
- What does it cost to enter the 10 gallon fish tank filter cartridges niche?
- Listings span $6.37–$22.54; the average listing price is $14.29 (sweet spot $15–$100). The average incumbent carries 12,594 reviews — the moat a new listing must climb.