fish tank filter
Worth a lookShows beatable incumbent ratings (4.0★), but soft demand (-14.2% this quarter) keeps it on the watch list.
Quality gap
Great4.0★avg incumbent rating — lower means beatable quality
Avg price
Great£15.68avg listing price — sweet spot $15–$100
Price range
Great£7.71–£37.55cheapest to priciest tracked listing — scored on the share inside $15–$100
Market size
Good£601K£601K/yr · 976K searches
Returns
Good2.5%return rate — above 5% kills the launch gate
Brand share
Good74%top-5 brand share — brands hold most of the demand
Review moat
Good1,440avg incumbent reviews — the moat a new listing must climb
Conversion
Okay3.9%search→purchase rate — share of searches ending in a sale
Competition
Okay62%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
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.No pronounced peak months · busiest ÷ quietest = 1.2×
Top fish tank filter search terms
- fish tank filter429K/yr
- aquarium filter185K/yr
- fish tank pump50K/yr
- fish tank filter pump45K/yr
- fish filter31K/yr
- small fish tank filter31K/yr
- filter for fish tanks24K/yr
- fish tank pump and filter24K/yr
- fish tank filters20K/yr
- aquarium pumps & filters20K/yr
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.
All 22 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
NICREW Fish Tank Filter Internal Aquarium Filter for Small Tank Coldwater or Tropical Aquariums Up to 20L Black
NICREW£11.154.3★2,242 rev
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£16.533.8★873 rev
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£12.814.2★1,672 rev
Interpet Internal Aquarium Fish Tank PF1 Power Filter Cleans Water for Coldwater & Tropical Aquariums Up to 68 Litre black/blue
Interpet£13.164.2★2,747 rev
Craftsboys Fish Tank Filter Silent Internal Aquarium Filter Clean Water Air Pump Make Waves (4W-450L/H Black)
Craftsboys£8.203.9★879 rev
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£26.4023 rev
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£8.5524 rev
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£9.7843 rev
AQQA Fish Tank Filter 550L/h Internal Aquarium Filter 6W Quiet Fish Tank Filter Pump for Tanks up to 130L
AQQA£16.0275 rev
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£11.29101 rev
Trending
90-day click momentumAquapapa 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£26.404.2★
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£9.783.5★
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£8.554.4★
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£20.553.9★
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£19.814.3★
What buyers say about fish tank filter
What buyers praise and complain about, mined from review topics.What buyers love
“Decent filter”
“reasonable price”
“Very good quality”
“Excellent as described”
“Easy to clean”
“Absolutely perfect flow”
“works well, quite powerful for size”
“Perfect for small tank”
“the water clarity has noticeably improved”
“Easy to set up”
What buyers complain about
“Broke within a week”
“Terrible filter”
“Not a good quality”
“Very small”
“it barely works”
“Considering the price I am very disappointed”
“The instructions are not the best”
“Eu lead & uk adaptor doesnt fit”
“can be difficult to clean”
“Loud as anything”
Top return reasons
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.