---
title: "Fish Tank Filter — £601K/yr Amazon UK Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/uk/pet-supplies/fish-tank-filter"
last_updated: "2026-07-31T08:49:59.815Z"
locale: en
meta:
description: "Niche score 54/100 · £601K/yr market · 976K searches/yr · £15.68 avg price. Soft demand (-14.2% this quarter) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 54/100 · £601K/yr market · 976K searches/yr · £15.68 avg price. Soft demand (-14.2% this quarter) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Fish Tank Filter — £601K/yr Amazon UK Niche (2026) - Flapen"
---
# **fish tank filter**
**Worth a look**
Shows beatable incumbent ratings (4.0★), but soft demand (-14.2% this quarter) keeps it on the watch list.
Market size 64Growth 18Conversion 49Competition 38Returns 63Price range 75Avg price 77Brand share 52Review moat 52Quality gap 94
**Quality gap**
**Great****4.0★**
avg incumbent rating — lower means beatable quality
**Avg price**
**Great****£15.68**
avg listing price — sweet spot $15–$100
**Price range**
**Great****£7.71–£37.55**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Market size**
**Good****£601K**
£601K/yr · 976K searches
**Returns**
**Good****2.5%**
return rate — above 5% kills the launch gate
**Brand share**
**Good****74%**
top-5 brand share — brands hold most of the demand
**Review moat**
**Good****1,440**
avg incumbent reviews — the moat a new listing must climb
**Conversion**
**Okay****3.9%**
search→purchase rate — share of searches ending in a sale
**Competition**
**Okay****62%**
top-5 click share — leaders hold, buyers still browse
**Growth**
**Bad****-14.2%**
90-day search growth — must beat 0% to launch
According to Flapen's Amazon United Kingdom niche tracking, fish tank filter is a £601K/yr Amazon United Kingdom market (976K searches/yr). The top 5 brands hold 74% of demand. Verdict: Worth a look — 54/100.
Data updated Jul 29, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **fish tank filter market data**
- **Units sold / yr**
- **30K–40K**
- avg 1,000–1,250/product
- **Revenue / yr**
- **£470K–£627K**
- units × avg price
- **Conversion rate**
- **3.9%**
- **Avg BSR**
- **#20**
- **Page quality**
- **0%**
- **Prime**
- **91%**
- **Sponsored**
- **77%**
- **Out of stock**
- **2.1%**
- **Avg brand age**
- **44 months**
- **Avg seller age**
- **169 days**
## **Competition & brand share**
The top 5 products take 62% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**15 **▼falling
**Sellers**
**84**
**Top-5 brand share**
**74%**
Top 20: 100%
**Top-5 click share**
**62%**
Top 20: 98%
**Open market**
**22%**
- NICREW27% - Interpet18% - OsAtNb13% - Craftsboys8% - Pawfly7% - BAITAI5%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -14.2% search growth over the last 90 days.
20K15K seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.2×
[**Open Trend **](https://flapen.com/research/uk/pet-supplies/fish-tank-filter/trend)
## **Top fish tank filter search terms**
- **fish tank filter**429K/yr-14.5%2.8% conv. - **aquarium filter**185K/yr-11.0%1.2% conv. - **fish tank pump**50K/yr-15.6%2.2% conv. - **fish tank filter pump**45K/yr-13.4%3.2% conv. - **fish filter**31K/yr-14.2%3.1% conv. - **small fish tank filter**31K/yr-26.9%3.4% conv. - **filter for fish tanks**24K/yr-7.4%2.6% conv. - **fish tank pump and filter**24K/yr-28.3%4.0% conv. - **fish tank filters**20K/yr-9.1%1.1% conv. - **aquarium pumps & filters**20K/yr-22.1%1.0% conv. [**All search terms **](https://flapen.com/research/uk/pet-supplies/fish-tank-filter/search-terms)
## **Top fish tank filter 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%10%£60K20%£120K30%£180K40%£241K101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 22 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**NICREW Fish Tank Filter Internal Aquarium Filter for Small Tank Coldwater or Tropical Aquariums Up to 20L Black**NICREW**£11.15**4.3★2,242 rev](https://www.amazon.co.uk/dp/B09KL1R12Y) [2**OsAtNb Quiet Fish Tank Filter 4-in-1 Internal Aquarium Filter for 20L-200L Submersible Water Pump Oxygen Aeration Wave Maker Water Change for Betta Turtle Pond Fish Garden(S)**OsAtNb**£16.53**3.8★873 rev](https://www.amazon.co.uk/dp/B094H12D2Z) [3**Interpet Internal Aquarium Fish Tank Filter Bio CF1 Includes Coir Tech Bio Cartridges High Flow Silent Filtration Cleans Water for Coldwater & Tropical 36-68 Litres (Aquarium length up to 60cm)**Interpet**£12.81**4.2★1,672 rev](https://www.amazon.co.uk/dp/B00HFTFP3Q) [4**Interpet Internal Aquarium Fish Tank PF1 Power Filter Cleans Water for Coldwater & Tropical Aquariums Up to 68 Litre black/blue**Interpet**£13.16**4.2★2,747 rev](https://www.amazon.co.uk/dp/B001BXC3QY) [5**Craftsboys Fish Tank Filter Silent Internal Aquarium Filter Clean Water Air Pump Make Waves (4W-450L/H Black)**Craftsboys**£8.20**3.9★879 rev](https://www.amazon.co.uk/dp/B09YTKTHRT)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Aquapapa U-V Fish Tank Filter 8W 500L/H Aquarium Filter Pump with 6-Layer Filtration for 30110L Tanks Internal Multifunctional Fish Tank Pump with Sponge Filter for Crystal Clear Water**Aquapapa**£26.40**23 rev3mo ago](https://www.amazon.co.uk/dp/B0GX5T811R) [**PYPABL Submersible Fish Tank Internal Filter Mini Aquarium Filter with Water Pump for up to 75L Fish and Shrimp Tank(3W for 3-40L Tank)**PYPABL**£8.55**24 rev8mo ago](https://www.amazon.co.uk/dp/B0FZST4R5S) [**Pawfly 3 W Small Fish Tank Filter 300 L Aquarium Filter Internal Submersible Aquarium Filter with Foam & Adjustable Water Pump Quiet Filter for 30-80 L Fish Tanks**Pawfly**£9.78**43 rev8mo ago](https://www.amazon.co.uk/dp/B0FZJKC63X) [**AQQA Fish Tank Filter 550L/h Internal Aquarium Filter 6W Quiet Fish Tank Filter Pump for Tanks up to 130L**AQQA**£16.02**75 rev1y ago](https://www.amazon.co.uk/dp/B0FDQH3PKF) [**VILLNO 8W 400LPH Ultra Powerful Aquarium Filter for 30-90L Fish Tank 3-IN-1 Adjustable Fish Tank Filter with Biochemical Sponge Internal Submersible Fish Tank Filters for Turtle/Shrimp/Breeding**VILLNO**£11.29**101 rev1y ago](https://www.amazon.co.uk/dp/B0DM5432Z2)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Aquapapa U-V Fish Tank Filter 8W 500L/H Aquarium Filter Pump with 6-Layer Filtration for 30110L Tanks Internal Multifunctional Fish Tank Pump with Sponge Filter for Crystal Clear Water**Aquapapa**£26.40**4.2★**▲ 309%**](https://www.amazon.co.uk/dp/B0GX5T811R) [**Pawfly 3 W Small Fish Tank Filter 300 L Aquarium Filter Internal Submersible Aquarium Filter with Foam & Adjustable Water Pump Quiet Filter for 30-80 L Fish Tanks**Pawfly**£9.78**3.5★**▲ 154%**](https://www.amazon.co.uk/dp/B0FZJKC63X) [**PYPABL Submersible Fish Tank Internal Filter Mini Aquarium Filter with Water Pump for up to 75L Fish and Shrimp Tank(3W for 3-40L Tank)**PYPABL**£8.55**4.4★**▲ 139%**](https://www.amazon.co.uk/dp/B0FZST4R5S) [**BAITAI Internal UV Fish Tank Filter 400L/H 4W Aquarium Filter Pump Turns Green Water to Clear 5-in-1 Filter Pump for 15-80L Aquarium Flow Rate and Direction Adjustable**BAITAI**£20.55**3.9★**▲ 32%**](https://www.amazon.co.uk/dp/B0CCMGX8RG) [**Interpet Internal Aquarium Fish Tank Filter Bio CF2 Includes Coir Tech Bio Cartridges High Flow Silent Filtration Cleans Water for Coldwater & Tropical 69-110 Litres (Aquarium length up to 80cm)**Interpet**£19.81**4.3★**▲ 32%**](https://www.amazon.co.uk/dp/B00ITQKZIE)
**~~View all trending →~~**
## **What buyers say about fish tank filter**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Filtration**29%
*“Decent filter”*
**Value For Money**15%
*“reasonable price”*
**Quality-Overall**10%
*“Very good quality”*
**Advertised Vs Actual Product**8%
*“Excellent as described”*
**Ease Of Cleaning**7%
*“Easy to clean”*
**Spray/Flow**5%
*“Absolutely perfect flow”*
**Strength**4%
*“works well, quite powerful for size”*
**Size-Overall**3%
*“Perfect for small tank”*
**Water Flow**3%
*“the water clarity has noticeably improved”*
**Assembly/Installation**2%
*“Easy to set up”*
### **What buyers complain about **
**Durability**22%
*“Broke within a week”*
**Filtration**15%
*“Terrible filter”*
**Quality-Overall**8%
*“Not a good quality”*
**Size-Overall**7%
*“Very small”*
**Functionality-Overall**6%
*“it barely works”*
**Value For Money**3%
*“Considering the price I am very disappointed”*
**Instructions/User Manual/Troubleshooting**2%
*“The instructions are not the best”*
**Compatibility-Overall**2%
*“Eu lead & uk adaptor doesnt fit”*
**Ease Of Cleaning**2%
*“can be difficult to clean”*
**Noise Level**2%
*“Loud as anything”*
### **Top return reasons **
**Size-Overall**33%
**Filtration**17%
**Functionality-Overall**15%
**Defective Material/Parts**8%
**Durability**5%
**Compatibility-Overall**5%
**Advertised Vs Actual Product**2%
**Strength**2%
**Quality-Overall**2%
**Water Flow**1%
## **Common questions**
- **Is fish tank filter profitable to sell on Amazon United Kingdom?**
- The niche generates £601K/yr across 22 tracked products. 1 of 3 products launched in the last 360 days are still selling. 90-day search growth is -14.2%. Flapen's verdict: Worth a look (54/100).
- **How competitive is the fish tank filter niche?**
- 15 brands and 84 sellers compete. The top 5 products take 62% of clicks and top 5 brands hold 74% of demand.
- **What do buyers complain about in fish tank filter?**
- Top complaints mined from reviews: Durability, Filtration, Quality-Overall. The return rate is 2.5%.
- **When does demand for fish tank filter peak?**
- Demand is steady year-round — the busiest month runs 1.2× the quietest.
- **What does it cost to enter the fish tank filter niche?**
- Listings span £7.71–£37.55; the average listing price is £15.68 (sweet spot $15–$100). The average incumbent carries 1,440 reviews — the moat a new listing must climb.
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