---
title: "Fish Tank Filter Cartridge — $189K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/pet-supplies/fish-tank-filter-cartridge"
last_updated: "2026-07-21T17:40:20.056Z"
locale: en
meta:
description: "Niche score 55/100 · $189K/yr market · 238K searches/yr · $12.92 avg price. Soft demand (-2.7% this quarter) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 55/100 · $189K/yr market · 238K searches/yr · $12.92 avg price. Soft demand (-2.7% this quarter) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Fish Tank Filter Cartridge — $189K/yr Amazon US Niche (2026) - Flapen"
---
# **fish tank filter cartridge**
**Worth a look**
Shows low returns (1.8%), but soft demand (-2.7% this quarter) keeps it on the watch list.
Market size 38Growth 24Conversion 68Competition 75Returns 80Price range 69Avg price 58Brand share 58Review moat 24Quality gap 62
**Returns**
**Great****1.8%**
return rate — above 6% kills the launch gate
**Competition**
**Great****40%**
top-5 click share — an open shelf
**Price range**
**Good****$6.37–$33.92**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Conversion**
**Good****6.2%**
search→purchase rate — share of searches ending in a sale
**Quality gap**
**Good****4.4★**
avg incumbent rating — lower means beatable quality
**Brand share**
**Good****70%**
top-5 brand share — brands hold most of the demand
**Avg price**
**Good****$12.92**
avg listing price — sweet spot $15–$100
**Market size**
**Okay****$189K**
$189K/yr · 238K searches
**Growth**
**Bad****-2.7%**
90-day search growth — must beat 0% to launch
**Review moat**
**Bad****6,267.2**
avg incumbent reviews — the moat a new listing must climb
According to Flapen's Amazon United States niche tracking, fish tank filter cartridge is a $189K/yr Amazon United States market (238K searches/yr). The top 5 brands hold 70% of demand. Demand peaks in Sep–Oct–Nov. Verdict: Worth a look — 55/100.
Data updated Jul 17, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **fish tank filter cartridge market data**
- **Units sold / yr**
- **15K–20K**
- avg 250–500/product
- **Revenue / yr**
- **$194K–$258K**
- units × avg price
- **Launch success**
- **17%**
- 1 of 6 new (360d)
- **Conversion rate**
- **6.2%**
- **Avg BSR**
- **#54**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **72%**
- **Out of stock**
- **0.7%**
- **Avg brand age**
- **53 months**
- **Avg seller age**
- **141 days**
## **Competition & brand share**
Clicks spread well past the top 5 (40% combined) — an open shelf where new products get seen.
**Brands**
**25 **—flat
**Sellers**
**94**
**Top-5 brand share**
**70%**
Top 20: 97%
**Top-5 click share**
**40%**
Top 20: 75%
**Open market**
**24%**
- Tetra37% - NICREW10% - Aqueon8% - HiTauing8% - Zuqqony7% - DaToo6%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -2.7% search growth over the last 90 days.
13K8KPrime Day '25Spike '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Sep, Oct, Nov · busiest ÷ quietest = 3.7×
[**Open Trend **](https://flapen.com/research/us/pet-supplies/fish-tank-filter-cartridge/trend)
## **Top fish tank filter cartridge search terms**
- **aquarium filter cartridge**22K/yr-2.9%3.2% conv. - **filter cartridge**17K/yr+53.4%0.5% conv. - **betta fish filter**18K/yr+3.3%3.4% conv. - **fish tank filter cartridge**21K/yr-13.1%4.2% conv. - **small tank filter**17K/yr-4.9%3.9% conv. - **betta tank filter**14K/yr-4.4%3.3% conv. - **beta fish tank filter**16K/yr-19.2%4.7% conv. - **beta fish filter**11K/yr+0.0%5.1% conv. - **tetra whisper filter medium**7K/yr+56.4%14.6% conv. - **filter cartridge fish tank**12K/yr-11.0%3.9% conv. [**All search terms **](https://flapen.com/research/us/pet-supplies/fish-tank-filter-cartridge/search-terms)
## **Top fish tank filter cartridge 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.
0%3%$6K6%$11K9%$17K12%$23K101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 50 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**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**$6.37**4.7★28,155 rev](https://www.amazon.com/dp/B0006JM09E) [2**Tetra Whisper 4i Internal Power Filter Filtration for Aquariums Between 1 and 4 Gallons**Tetra**$12.35**4.3★22,392 rev](https://www.amazon.com/dp/B07JC6LST2) [3**NICREW Slim Aquarium Filter Quiet Fish Tank HOB Filters for up to 5 Gallon Aquariums Adjustable Flow 42 GPH 3W**NICREW**$12.34**4.1★2,763 rev](https://www.amazon.com/dp/B0CGN1TV1G) [4**HiTauing 8 Pack EF-S Filter Cartridges for EF-S Element and BF5 BETTAFLO**HiTauing**$8.69**4.6★3,205 rev](https://www.amazon.com/dp/B0B9656RGN) [5**DaToo Aquarium Power Filter In-Tank Ultra Silent Small Fish Tank Filter 3W For Aquarium 1 to 10 Gallon Tank 1 Yr Warranty**DaToo**$7.75**4.0★3,198 rev](https://www.amazon.com/dp/B07DW577GB)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**ziqniot 6pcs EF-S Filter Cartridge Compatible EF-S Element/BF5 BETTAFLO 3.76x1.97 inch**ziqniot**$6.40**49 rev1mo ago](https://www.amazon.com/dp/B0G6WW2FND) [**Carefree Fish Aquarium Small Sponge Bubble Filter with Fish Poops Collector Quiet for 3~8Gal Fish Tank for Saltwater and Freshwater(Not Include Air Pump)**Carefree Fish**$9.82**30 rev3mo ago](https://www.amazon.com/dp/B0GC7835FY) [**12-Pack EF-S Replacement Filter Cartridges for BF5 BettaFlo Aquarium Professional Triple Filtration to Keep Water Crystal Clear & Fish Healthy High-Density Activated Carbon Refills for Fish Tank**Meidier**$7.24**75 rev5mo ago](https://www.amazon.com/dp/B0GJ768YK9) [**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**$22.25**130 rev8mo ago](https://www.amazon.com/dp/B0G2G93H3G) [**QiQiWader Small Aquarium Filter Fish Tank Filter Suitable for 3-10 Gallon Fish Tanks 3W 80GPH with Two Modes Switching Function.**QiQiWader**$16.80**98 rev9mo ago](https://www.amazon.com/dp/B0FVXFYFPQ)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Carefree Fish Aquarium Small Sponge Bubble Filter with Fish Poops Collector Quiet for 3~8Gal Fish Tank for Saltwater and Freshwater(Not Include Air Pump)**Carefree Fish**$9.82**4.0★**▲ 315%**](https://www.amazon.com/dp/B0GC7835FY) [**driamor 8 Pack PF-S Filter Cartridges Compatible with PF10 Power Filters Small Fish Tank Filters Cartridge Replacement with Zeolite**driamor**$9.60**4.6★**▲ 173%**](https://www.amazon.com/dp/B0CCQR6ZFB) [**12-Pack EF-S Replacement Filter Cartridges for BF5 BettaFlo Aquarium Professional Triple Filtration to Keep Water Crystal Clear & Fish Healthy High-Density Activated Carbon Refills for Fish Tank**Meidier**$7.24**4.1★**▲ 168%**](https://www.amazon.com/dp/B0GJ768YK9) [**ziqniot 6pcs EF-S Filter Cartridge Compatible EF-S Element/BF5 BETTAFLO 3.76x1.97 inch**ziqniot**$6.40**4.1★**▲ 154%**](https://www.amazon.com/dp/B0G6WW2FND) [**AQUANEAT 3 Pack Aquarium Bio Sponge Filter Breeding Fry Betta Shrimp Nano Fish Tank (Small up to 10Gal)**AQUANEAT**$6.55**4.7★**▲ 100%**](https://www.amazon.com/dp/B078HDL21V)
**~~View all trending →~~**
## **What buyers say about fish tank filter cartridge**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Filtration**28%
*“Excellent filters”*
**Value For Money**12%
*“Very affordable”*
**Size-Overall**12%
*“sizing is accurate”*
**Quality-Overall**10%
*“Excellent product”*
**Advertised Vs Actual Product**7%
*“As advertised”*
**Ease Of Cleaning**6%
*“It cleans well”*
**Ease Of Use**3%
*“Easy as pie”*
**Water Flow**3%
*“so quiet water flow is great”*
**Durability**2%
*“Durability is great as well”*
**Spray/Flow**2%
*“Allows the water to flow through”*
### **What buyers complain about **
**Durability**20%
*“Breaks easily”*
**Filtration**16%
*“Does not filter good”*
**Size-Overall**10%
*“they don't fit”*
**Quality-Overall**7%
*“I thought the quality would be off due to them not being name brand”*
**Functionality-Overall**6%
*“Not effective”*
**Leak-Proof**3%
*“It leaks”*
**Ease Of Cleaning**3%
*“is not easy to clean”*
**Water Flow**3%
*“The water flow is extremely weak”*
**Value For Money**2%
*“Price a little high, for filters”*
**Assembly/Installation**2%
*“Sadly, this is difficult to assemble”*
### **Top return reasons **
**Size-Overall**67%
**Filtration**15%
**Functionality-Overall**4%
**Advertised Vs Actual Product**3%
**Compatibility-Overall**3%
**Defective Material/Parts**2%
**Value For Money**1%
**Durability**1%
**Product Condition**1%
**Assembly/Installation**0%
## **Common questions**
- **Is fish tank filter cartridge profitable to sell on Amazon United States?**
- The niche generates $189K/yr across 50 tracked products. 1 of 6 products launched in the last 360 days are still selling. 90-day search growth is -2.7%. Flapen's verdict: Worth a look (55/100).
- **How competitive is the fish tank filter cartridge niche?**
- 25 brands and 94 sellers compete. The top 5 products take 40% of clicks and top 5 brands hold 70% of demand.
- **What do buyers complain about in fish tank filter cartridge?**
- Top complaints mined from reviews: Durability, Filtration, Size-Overall. The return rate is 1.8%.
- **When does demand for fish tank filter cartridge peak?**
- Demand peaks in Sep–Oct–Nov; the busiest month runs 3.7× the quietest.
- **What does it cost to enter the fish tank filter cartridge niche?**
- Listings span $6.37–$33.92; the average listing price is $12.92 (sweet spot $15–$100). The average incumbent carries 6,267 reviews — the moat a new listing must climb.
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