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.

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.

Quality gap

Incredible3.9★

avg incumbent rating — lower means beatable quality

Avg price

Great£47.02

avg listing price — sweet spot $15–$100

Review moat

Great421.93

avg incumbent reviews — the moat a new listing must climb

Competition

Good40%

top-5 click share — leaders hold, buyers still browse

Brand share

Good61%

top-5 brand share — brands hold most of the demand

Market size

Good£487K

£487K/yr · 2.4M searches

Returns

Okay3.0%

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

Bad0.4%

search→purchase rate — share of searches ending in a sale

Signals Quality Gap

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

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

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.

No pronounced peak months · busiest ÷ quietest = 1.3×

Open Trend

Top fish tank search terms

fish tank1.2M/yr -19.3%0.2% conv.
aquarium362K/yr -15.7%0.1% conv.
small fish tank130K/yr -18.4%0.5% conv.
fish tanks132K/yr -19.1%0.2% conv.
tropical fish tank85K/yr -35.7%0.2% conv.
betta fish tank54K/yr -32.7%0.4% conv.
axolotl tank30K/yr +6.9%0.0% conv.
large fish tank37K/yr -26.0%0.0% conv.
fish tanks for sale42K/yr -27.9%0.1% conv.
shrimp tank33K/yr -23.0%0.3% conv.

All 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.

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

Craftsboys 9L Fish Tank Nano Glass Aquarium Upgrade Filter system and LED Light for Freshwater & Marine Filter Balls Included (White 9L)

Craftsboys£30.163.3★336 rev

Diversa Aquarium Professional Fish Tank - Real Glass Standard Rectangle AQUARIUM ONLY - 25L (40x25x25cm)

Diversa£26.634.5★1,571 rev

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£35.324.1★49 rev

LED Glass Aquarium Fish Tank Starter Kit With Fish Net Led Light and Air Pump Filter (26L)

Pets Instinct£41.274.2★211 rev

Craftsboys 5.5L Fish Tank Starter Kits Nano Glass Aquarium with Filter Led Light for Aquascape DIY Small Betta Fish Tank

Craftsboys£24.233.6★548 rev

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£19.664 rev

3mo ago

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£35.3249 rev

9mo ago

Fluval Flex 2.0 Black Aquarium Kit 34 L

Fluval£82.6035 rev

10mo ago

Fluval Flex 2.0 Black Aquarium Kit 57 L

Fluval£109.7952 rev

10mo ago

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£28.3022 rev

11mo ago

What buyers say about fish tank

What buyers praise and complain about, mined from review topics.

What buyers love

Value For Money15%

“Excellent value for money”

Quality-Overall14%

“Good Quality Tank”

Filtration10%

“Filtration works perfectly”

Size-Overall8%

“Not too small not too big”

Design-Overall4%

“Design is cool”

Camera Quality3%

“Overall, this is a handy camera for pet monitoring, especially for aquariums, terrariums, or small animal setups”

Advertised Vs Actual Product3%

“Exactly as described”

Night Vision2%

“Colour night vision is brilliant”

Ease Of Cleaning2%

“Easy to keep clean”

Image/Picture Clarity2%

“the picture quality is solid”

What buyers complain about

Filtration23%

“Poor filter”

Size-Overall16%

“Too small”

Leak-Proof9%

“Leaking tank”

Quality-Overall5%

“its really poor quality”

Durability5%

“Broke”

Value For Money5%

“Not worth the price”

Functionality-Overall4%

“pump doesn't work”

Heating4%

“Heater is faulty”

Defective Material/Parts2%

“Faulty”

Instructions/User Manual/Troubleshooting2%

“Pump assembly instructions are confusing”

Top return reasons

Size-Overall52%

Filtration11%

Leak-Proof8%

Defective Material/Parts7%

Functionality-Overall3%

Quality-Overall2%

Water Resistance2%

Advertised Vs Actual Product1%

Heating1%

Bulb Flicker/Dimming/Color1%

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.