---
title: "Fish Tank — £487K/yr Amazon UK Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/uk/pet-supplies/fish-tank"
last_updated: "2026-07-31T07:19:53.341Z"
locale: en
meta:
description: "Niche score 56/100 · £487K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 56/100 · £487K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Fish Tank — £487K/yr Amazon UK Niche (2026) - Flapen"
---
# **fish tank**
**Worth a look**
Shows beatable incumbent ratings (3.9★), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size 59Growth 15Conversion 6Competition 75Returns 50Price range 45Avg price 94Brand share 73Review moat 79Quality gap 96
**Quality gap**
**Incredible****3.9★**
avg incumbent rating — lower means beatable quality
**Avg price**
**Great****£47.02**
avg listing price — sweet spot $15–$100
**Review moat**
**Great****421.93**
avg incumbent reviews — the moat a new listing must climb
**Competition**
**Good****40%**
top-5 click share — leaders hold, buyers still browse
**Brand share**
**Good****61%**
top-5 brand share — brands hold most of the demand
**Market size**
**Good****£487K**
£487K/yr · 2.4M searches
**Returns**
**Okay****3.0%**
return rate — above 5% kills the launch gate
**Price range**
**Okay****£12.25–£201.27**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Growth**
**Bad****-20.0%**
90-day search growth — must beat 0% to launch
**Conversion**
**Bad****0.4%**
search→purchase rate — share of searches ending in a sale
**Signals**[** Quality Gap**](https://flapen.com/research/niches?market=uk&signal=quality_gap "Avg rating < 4.0")
According to Flapen's Amazon United Kingdom niche tracking, fish tank is a £487K/yr Amazon United Kingdom market (2.4M searches/yr). The top 5 brands hold 61% of demand. Verdict: Worth a look — 56/100.
Data updated Jul 29, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **fish tank market data**
- **Units sold / yr**
- **8K–10K**
- avg 100–250/product
- **Revenue / yr**
- **£376K–£470K**
- units × avg price
- **Conversion rate**
- **0.4%**
- **Avg BSR**
- **#37**
- **Page quality**
- **0%**
- **Prime**
- **63%**
- **Sponsored**
- **71%**
- **Out of stock**
- **14.5%**
- **Avg brand age**
- **35 months**
- **Avg seller age**
- **171 days**
## **Competition & brand share**
The top 5 products take 40% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**21 **▼falling
**Sellers**
**33**
**Top-5 brand share**
**61%**
Top 20: 99%
**Top-5 click share**
**40%**
Top 20: 77%
**Open market**
**33%**
- Craftsboys25% - Swell UK11% - Diversa11% - Pets Instinct7% - Fluval7% - YISITONG6%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -20.0% search growth over the last 90 days.
60K40KHoliday '24Prime Day '25Spike '25 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.3×
[**Open Trend **](https://flapen.com/research/uk/pet-supplies/fish-tank/trend)
## **Top fish tank search terms**
- **fish tank**1.2M/yr-19.3%0.2% conv. - **aquarium**362K/yr-15.7%0.1% conv. - **small fish tank**130K/yr-18.4%0.5% conv. - **fish tanks**132K/yr-19.1%0.2% conv. - **tropical fish tank**85K/yr-35.7%0.2% conv. - **betta fish tank**54K/yr-32.7%0.4% conv. - **axolotl tank**30K/yr+6.9%0.0% conv. - **large fish tank**37K/yr-26.0%0.0% conv. - **fish tanks for sale**42K/yr-27.9%0.1% conv. - **shrimp tank**33K/yr-23.0%0.3% conv. [**All search terms **](https://flapen.com/research/uk/pet-supplies/fish-tank/search-terms)
## **Top fish tank 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%4%£19K8%£39K12%£58K16%£78K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 24 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Craftsboys 9L Fish Tank Nano Glass Aquarium Upgrade Filter system and LED Light for Freshwater & Marine Filter Balls Included (White 9L)**Craftsboys**£30.16**3.3★336 rev](https://www.amazon.co.uk/dp/B0D412RH1X) [2**Diversa Aquarium Professional Fish Tank - Real Glass Standard Rectangle AQUARIUM ONLY - 25L (40x25x25cm)**Diversa**£26.63**4.5★1,571 rev](https://www.amazon.co.uk/dp/B07DXSZ1RQ) [3**YISITONG Fish Tank 3 Gallon Aquarium Starter Kit with Filter and LED Lighting (17 Color Choices) 360 View Aquarium for Small Fish Quiet Desktop Aquarium for Home Office Best Gifts**YISITONG**£35.32**4.1★49 rev](https://www.amazon.co.uk/dp/B0FVFBYCRK) [4**LED Glass Aquarium Fish Tank Starter Kit With Fish Net Led Light and Air Pump Filter (26L)**Pets Instinct**£41.27**4.2★211 rev](https://www.amazon.co.uk/dp/B0B8DWW442) [5**Craftsboys 5.5L Fish Tank Starter Kits Nano Glass Aquarium with Filter Led Light for Aquascape DIY Small Betta Fish Tank**Craftsboys**£24.23**3.6★548 rev](https://www.amazon.co.uk/dp/B0CJ4N48RY)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**BREEZENEST Aquarium Kit Compact Betta Fish Tank Office Fish Tank Bedroom Aquarium Clear Viewing Tank Ecological Cycle System Aquarium Gift Set for Desktop Office or Home Décor Black**BREEZENEST**£19.66**4 rev3mo ago](https://www.amazon.co.uk/dp/B0GYWWH4GF) [**YISITONG Fish Tank 3 Gallon Aquarium Starter Kit with Filter and LED Lighting (17 Color Choices) 360 View Aquarium for Small Fish Quiet Desktop Aquarium for Home Office Best Gifts**YISITONG**£35.32**49 rev9mo ago](https://www.amazon.co.uk/dp/B0FVFBYCRK) [**Fluval Flex 2.0 Black Aquarium Kit 34 L**Fluval**£82.60**35 rev10mo ago](https://www.amazon.co.uk/dp/B0FQP8488X) [**Fluval Flex 2.0 Black Aquarium Kit 57 L**Fluval**£109.79**52 rev10mo ago](https://www.amazon.co.uk/dp/B0FQP5XD64) [**Small Glass Aquarium Tank 8L with Filter and Light All-in-One Desktop Glass Fish Tank Kit with Pump for Goldfish Betta Shrimp White**1ZIZIFA8**£28.30**22 rev11mo ago](https://www.amazon.co.uk/dp/B0FPFV8TH8)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**BREEZENEST Aquarium Kit Compact Betta Fish Tank Office Fish Tank Bedroom Aquarium Clear Viewing Tank Ecological Cycle System Aquarium Gift Set for Desktop Office or Home Décor Black**BREEZENEST**£19.66**3.4★**▲ 313%**](https://www.amazon.co.uk/dp/B0GYWWH4GF) [**Diversa Aquarium Professional Fish Tank - Real Glass Standard Rectangle AQUARIUM ONLY - 54L (60x30x30cm)**Diversa**£59.01**4.5★**▲ 135%**](https://www.amazon.co.uk/dp/B0B1W3F46Y) [**Small Glass Aquarium Tank 8L with Filter and Light All-in-One Desktop Glass Fish Tank Kit with Pump for Goldfish Betta Shrimp White**1ZIZIFA8**£28.30**3.4★**▲ 119%**](https://www.amazon.co.uk/dp/B0FPFV8TH8) [**YISITONG Fish Tank 3 Gallon Aquarium Starter Kit with Filter and LED Lighting (17 Color Choices) 360 View Aquarium for Small Fish Quiet Desktop Aquarium for Home Office Best Gifts**YISITONG**£35.32**4.1★**▲ 114%**](https://www.amazon.co.uk/dp/B0FVFBYCRK) [**Ferplast Plastic Container for Small Animals GEO EXTRA LARGE Aquarium Tank 11 L for Fishes Terrarium Turtles Insects Sturdy Plastic Ventilation Grills 35 6 x 23 4 x h 22 8 cm Red**Ferplast**£16.01**4.3★**▲ 104%**](https://www.amazon.co.uk/dp/B00F5ZZERE)
**~~View all trending →~~**
## **What buyers say about fish tank**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Value For Money**15%
*“Excellent value for money”*
**Quality-Overall**14%
*“Good Quality Tank”*
**Filtration**10%
*“Filtration works perfectly”*
**Size-Overall**8%
*“Not too small not too big”*
**Design-Overall**4%
*“Design is cool”*
**Camera Quality**3%
*“Overall, this is a handy camera for pet monitoring, especially for aquariums, terrariums, or small animal setups”*
**Advertised Vs Actual Product**3%
*“Exactly as described”*
**Night Vision**2%
*“Colour night vision is brilliant”*
**Ease Of Cleaning**2%
*“Easy to keep clean”*
**Image/Picture Clarity**2%
*“the picture quality is solid”*
### **What buyers complain about **
**Filtration**23%
*“Poor filter”*
**Size-Overall**16%
*“Too small”*
**Leak-Proof**9%
*“Leaking tank”*
**Quality-Overall**5%
*“its really poor quality”*
**Durability**5%
*“Broke”*
**Value For Money**5%
*“Not worth the price”*
**Functionality-Overall**4%
*“pump doesn't work”*
**Heating**4%
*“Heater is faulty”*
**Defective Material/Parts**2%
*“Faulty”*
**Instructions/User Manual/Troubleshooting**2%
*“Pump assembly instructions are confusing”*
### **Top return reasons **
**Size-Overall**52%
**Filtration**11%
**Leak-Proof**8%
**Defective Material/Parts**7%
**Functionality-Overall**3%
**Quality-Overall**2%
**Water Resistance**2%
**Advertised Vs Actual Product**1%
**Heating**1%
**Bulb Flicker/Dimming/Color**1%
## **Common questions**
- **Is fish tank profitable to sell on Amazon United Kingdom?**
- The niche generates £487K/yr across 41 tracked products. 5 of 13 products launched in the last 360 days are still selling. 90-day search growth is -20.0%. Flapen's verdict: Worth a look (56/100).
- **How competitive is the fish tank niche?**
- 21 brands and 33 sellers compete. The top 5 products take 40% of clicks and top 5 brands hold 61% of demand.
- **What do buyers complain about in fish tank?**
- Top complaints mined from reviews: Filtration, Size-Overall, Leak-Proof. The return rate is 3.0%.
- **When does demand for fish tank peak?**
- Demand is steady year-round — the busiest month runs 1.3× the quietest.
- **What does it cost to enter the fish tank niche?**
- Listings span £12.25–£201.27; the average listing price is £47.02 (sweet spot $15–$100). The average incumbent carries 422 reviews — the moat a new listing must climb.
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