Is fish filters large profitable to sell on Amazon United States?

The niche generates $161K/yr across 7 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is +106.2%. Flapen's verdict: Worth a look (50/100).

How competitive is the fish filters large niche?

4 brands and 15 sellers compete. The top 5 products take 92% of clicks and top 5 brands hold 100% of demand.

What do buyers complain about in fish filters large?

Top complaints mined from reviews: Quality-Overall, Filtration, Durability. The return rate is 1.2%.

What does it cost to enter the fish filters large niche?

Listings span $6.38–$32.94; the average listing price is $19.61 (sweet spot $15–$100). The average incumbent carries 6,584 reviews — the moat a new listing must climb.

fish filters large

Worth a look

Shows demand growing +106.2% this quarter, but brand-locked demand (top 5 brands take 100% of clicks) keeps it on the watch list.

Growth

Great+106.2%

90-day search growth — must beat 0% to launch

Returns

Great1.2%

return rate — above 6% kills the launch gate

Conversion

Great9.9%

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

Avg price

Great$19.61

avg listing price — sweet spot $15–$100

Price range

Good$6.38–$32.94

cheapest to priciest tracked listing — scored on the share inside $15–$100

Quality gap

Okay4.5★

avg incumbent rating — lower means beatable quality

Market size

Okay$161K

$161K/yr · 82K searches

Review moat

Bad6,584.29

avg incumbent reviews — the moat a new listing must climb

Competition

Bad92%

top-5 click share — a locked-up shelf

Brand share

Bad100%

top-5 brand share — brand-locked demand

According to Flapen's Amazon United States niche tracking, fish filters large is a $161K/yr Amazon United States market (82K searches/yr). The top 5 brands hold 100% of demand. Verdict: Worth a look — 50/100.

Data updated Jul 17, 2026 · scored weekly · How we score niches

fish filters large market data

Units sold / yr: 13K–15K; avg 1,500–2,000/product
Revenue / yr: $245K–$294K; units × avg price
Launch success: —; 1 of 1 new (360d)
Conversion rate: 9.9%
Avg BSR: #85
Page quality: 0%
Prime: 100%
Sponsored: 71%
Out of stock: 0.0%
Avg brand age: 48 months
Avg seller age: 140 days

Competition & brand share

The top 5 products capture 92% of clicks — a locked-up shelf that new listings rarely crack.

Brands

4 rising

Sellers

Top-5 brand share

100%

Top 20: 100%

Top-5 click share

92%

Top 20: 100%

Open market

Tetra79%
Esctabalt10%
xbbwmrs6%
Casuenia5%

Top fish filters large search terms

tetra whisper filter large26K/yr +148.0%9.1% conv.
tetra whisper bio-bag filter cartridges large13K/yr +190.6%3.6% conv.
whisper bio bag filter cartridges large15K/yr +101.0%7.0% conv.
tetra large filter5K/yr +488.2%1.9% conv.
tetra large filter cartridges8K/yr -3.2%11.7% conv.
fish filters large5K/yr -8.9%7.0% conv.
tetra bio bag filter cartridges large4K/yr +4.5%11.1% conv.
large fish filter3K/yr +17.8%8.2% conv.
fish tank filters large3K/yr -18.6%3.8% conv.

All search terms

Top fish filters large 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 7 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Tetra Whisper Bio-Bag Large Filter Cartridges for Aquariums 12 Count Unassembled Fits Tetra Whisper Fish Tank Filters 10-30 Gal 20-40 Gal PF-20 30 40 60 IQ 20 30 45 60

Tetra$13.894.7★16,692 rev

Tetra Whisper Bio-Bag Large Filter Cartridges for Aquariums 3 Count Ready to Use Fits Tetra Whisper Fish Tank Filters 10-30 Gal 20-40 Gal PF-20 30 40 60 IQ 20 30 45 60

Tetra$6.384.7★13,230 rev

Esctabalt 16 Count Large Filter Cartridges Compatible with Whisper Bio Bag Filters Large Aquarium Filter Cartridge for Whisper 20i 40i IQ20/30/45/60 PF20/30/40/60 and Repto Filter

Esctabalt$24.484.3★665 rev

xbbwmrs 8-Pack Large Replacement Filter Cartridges Compatible with Tetra Whisper Bio-Bag Filters Large Aquarium Filter Cartridges for Whisper 20i/40i IQ20/30/45/60 PF20/30/40/60 Power Filters

xbbwmrs$22.954.7★631 rev

Casuenia 16 Pack Large Filter Cartridges for Tetra Whisper Bio-Bag Filters Aquarium Replacement Filter Cartridges for Whisper 20i/40i IQ20/30/45/60 PF20/30/40/60 and Repto Filter

Casuenia$21.394.5★111 rev

Newest

by launch date

Casuenia 16 Pack Large Filter Cartridges for Tetra Whisper Bio-Bag Filters Aquarium Replacement Filter Cartridges for Whisper 20i/40i IQ20/30/45/60 PF20/30/40/60 and Repto Filter

Casuenia$21.39111 rev

9mo ago

Esctabalt 16 Count Large Filter Cartridges Compatible with Whisper Bio Bag Filters Large Aquarium Filter Cartridge for Whisper 20i 40i IQ20/30/45/60 PF20/30/40/60 and Repto Filter

Esctabalt$24.48665 rev

2y ago

xbbwmrs 8-Pack Large Replacement Filter Cartridges Compatible with Tetra Whisper Bio-Bag Filters Large Aquarium Filter Cartridges for Whisper 20i/40i IQ20/30/45/60 PF20/30/40/60 Power Filters

xbbwmrs$22.95631 rev

2y ago

Tetra Whisper IQ Power Filter 45 Gallons 215 GPH with Stay Clean Technology

Tetra$32.9413,787 rev

9y ago

Tetra Whisper Large Aquarium Filter Cartridge 3pk

Tetra$15.24974 rev

15y ago

What buyers say about fish filters large

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

What buyers love

Filtration24%

“Good filters”

Quality-Overall15%

“No complaints at all”

Value For Money13%

“Great price”

Size-Overall11%

“Fit perfect”

Advertised Vs Actual Product9%

“As advertised”

Ease Of Use6%

“quick in my tank”

Ease Of Cleaning5%

“Great cleaning”

Durability3%

“they hold up fine”

Spray/Flow2%

“the water flow compared to my old ones is fabulous”

Water Flow2%

“Does great job to have clear water”

What buyers complain about

Quality-Overall16%

“Low Quality”

Filtration16%

“Cheaply made filters”

Durability14%

“Don't last that long only one week”

Functionality-Overall8%

“Doesn't work”

Size-Overall7%

“also, this filter is quite big”

Value For Money5%

“Costs more to return”

Carbon Footprint3%

“Feel like theres less carbon inside than most”

Ease Of Cleaning3%

“Cheap way to keep your tank clean”

Thickness2%

“The filter is thin or lighter than others”

Assembly/Installation2%

“Assembly required”

Top return reasons

Size-Overall55%

Filtration21%

Advertised Vs Actual Product4%

Defective Material/Parts3%

Functionality-Overall3%

Compatibility-Overall3%

Assembly/Installation2%

Value For Money2%

Leak-Proof1%

Durability1%

Common questions

Is fish filters large profitable to sell on Amazon United States?: The niche generates $161K/yr across 7 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is +106.2%. Flapen's verdict: Worth a look (50/100).
How competitive is the fish filters large niche?: 4 brands and 15 sellers compete. The top 5 products take 92% of clicks and top 5 brands hold 100% of demand.
What do buyers complain about in fish filters large?: Top complaints mined from reviews: Quality-Overall, Filtration, Durability. The return rate is 1.2%.
What does it cost to enter the fish filters large niche?: Listings span $6.38–$32.94; the average listing price is $19.61 (sweet spot $15–$100). The average incumbent carries 6,584 reviews — the moat a new listing must climb.