1 gallon fish tank filter
Skip itBrand-locked demand (top 5 brands take 96% of clicks) — this niche doesn't clear our bar today.
Avg price
Great$48.69avg listing price — sweet spot $15–$100
Quality gap
Great4.3★avg incumbent rating — lower means beatable quality
Market size
Good$385K$385K/yr · 179K searches
Competition
Good52%top-5 click share — leaders hold, buyers still browse
Conversion
Good4.4%search→purchase rate — share of searches ending in a sale
Returns
Good2.8%return rate — above 6% kills the launch gate
Review moat
Okay3,002.56avg incumbent reviews — the moat a new listing must climb
Price range
Okay$7.75–$314.10cheapest to priciest tracked listing — scored on the share inside $15–$100
Growth
Bad-9.4%90-day search growth — must beat 0% to launch
Brand share
Bad96%top-5 brand share — brand-locked demand
According to Flapen's Amazon United States niche tracking, 1 gallon fish tank filter is a $385K/yr Amazon United States market (179K searches/yr). The top 5 brands hold 96% of demand. Verdict: Skip it — 47/100.
Data updated Jul 17, 2026 · scored weekly · How we score niches
1 gallon fish tank filter market data
- Units sold / yr
- 8K–10K
- avg 250–500/product
- Revenue / yr
- $390K–$487K
- units × avg price
- Launch success
- —
- 0 of 2 new (360d)
- Conversion rate
- 4.4%
- Avg BSR
- #76
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 76%
- Out of stock
- 8.7%
- Avg brand age
- 47 months
- Avg seller age
- 165 days
Competition & brand share
The top 5 products take 52% of clicks — established leaders, but buyers still shop beyond them.Brands
7 falling
Sellers
21
Top-5 brand share
96%
Top 20: 100%
Top-5 click share
52%
Top 20: 92%
Open market
2%
- NICREW77%
- Tetra7%
- DaToo6%
- Aqueon3%
- Novique2%
- HSIFMATE2%
- Open — no brand owns it (1 brand, 2%)
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -9.4% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.5×
Top 1 gallon fish tank filter search terms
- nicrew aquarium light21K/yr
- nano aquarium filter18K/yr
- nicrew18K/yr
- nicrew filter14K/yr
- 1 gallon fish tank filter15K/yr
- nano tank filter12K/yr
- shrimp filter10K/yr
- nano filter aquarium8K/yr
- nicrew led aquarium light23K/yr
- beta filter6K/yr
Top 1 gallon 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 25 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
NICREW Slim Aquarium Filter Quiet Fish Tank HOB Filters for up to 5 Gallon Aquariums Adjustable Flow 42 GPH 3W
NICREW$12.344.1★2,763 rev
NICREW ClassicLED Plus LED Aquarium Light with Timer 21 Watts for 30 to 36 Inch Fish Tank Light Daylight and Moonlight Cycle
NICREW$41.004.6★9,021 rev
Tetra Whisper 4i Internal Power Filter Filtration for Aquariums Between 1 and 4 Gallons
Tetra$12.354.3★22,392 rev
NICREW C10 24/7 LED Aquarium Light for Plants 12-18 Inches Full Spectrum Fish Tank Light with Timer Brightness Adjustable
NICREW$17.574.3★1,480 rev
NICREW C10 Plants LED Aquarium Light 18-24 in 13 Watts Full Spectrum Fish Tank Light with Timer Day and Night Cycle Brightness Adjustable
NICREW$23.884.6★1,016 rev
Newest
by launch date
HSIFMATE Small Fish Tank Filter Hang on Filter for 1-5 Gal Nano Aquarium Ultra Quiet Power Filter with Aeration & Oil Skimmer Adjustable Flow for Betta Shrimp Tank
HSIFMATE$11.5711 rev
Novique HOB Slim Aquarium Filter for Up to 5 Gallon Tank Ultra-Quiet Fish Tank Power Filter Flow Adjustable Suitable for Saltwater and Freshwater 42 GPH 3W
Novique$8.96119 rev
NICREW NavaReef 65 Reef LED Light 65W Reef Aquarium Lighting for Soft/LPS Corals and Saltwater Fish Tanks Built-in Timer Blue Focused Spectrum
NICREW$95.60146 rev
SmtaqX 8 Pack Aquarium Filter Cartridges Compatible with NICREW Slim Filter Fish Tank Filter Cartridges Replacement
SmtaqX$8.9041 rev
NICREW HyperReef 200 Gen 2 Reef LED Light 200W Reef Aquarium Lighting for SPS LPS Corals and Saltwater Fish Tanks Enhanced Violet and Blue Spectrum Wide Angle Lens 5 Channels Fully Programmable
NICREW$314.10258 rev
Trending
90-day click momentumHSIFMATE Small Fish Tank Filter Hang on Filter for 1-5 Gal Nano Aquarium Ultra Quiet Power Filter with Aeration & Oil Skimmer Adjustable Flow for Betta Shrimp Tank
HSIFMATE$11.573.6★
SmtaqX 8 Pack Aquarium Filter Cartridges Compatible with NICREW Slim Filter Fish Tank Filter Cartridges Replacement
SmtaqX$8.904.3★
Novique HOB Slim Aquarium Filter for Up to 5 Gallon Tank Ultra-Quiet Fish Tank Power Filter Flow Adjustable Suitable for Saltwater and Freshwater 42 GPH 3W
Novique$8.963.9★
NICREW C10 24/7 LED Aquarium Light for Plants 12-18 Inches Full Spectrum Fish Tank Light with Timer Brightness Adjustable
NICREW$17.574.3★
DaToo Aquarium Hang On Filter Small Fish Tank Hanging Filter Power Waterfall Filtration System
DaToo$7.973.8★
What buyers say about 1 gallon fish tank filter
What buyers praise and complain about, mined from review topics.What buyers love
“Filter works great”
“this thing is stunningly bright”
“Great value”
“Good fit”
“The best features:”
“Came as advertised”
“Keep your tank clean”
“I love the fact that the water flow is adjustable”
“Super powerful for such a small filter”
“Ease of use”
What buyers complain about
“Breaks easily”
“Not a good filter for money”
“Super Small”
“Not effective”
“Bad quality”
“It leaks”
“feels flimsy”
“it doesn't do the best job of keeping the tank clean”
“The water flow is extremely weak”
“Do not waste your money”
Top return reasons
Common questions
- Is 1 gallon fish tank filter profitable to sell on Amazon United States?
- The niche generates $385K/yr across 25 tracked products. 0 of 2 products launched in the last 360 days are still selling. 90-day search growth is -9.4%. Flapen's verdict: Skip it (47/100).
- How competitive is the 1 gallon fish tank filter niche?
- 7 brands and 21 sellers compete. The top 5 products take 52% of clicks and top 5 brands hold 96% of demand.
- What do buyers complain about in 1 gallon fish tank filter?
- Top complaints mined from reviews: Durability, Filtration, Size-Overall. The return rate is 2.8%.
- When does demand for 1 gallon fish tank filter peak?
- Demand is steady year-round — the busiest month runs 1.5× the quietest.
- What does it cost to enter the 1 gallon fish tank filter niche?
- Listings span $7.75–$314.10; the average listing price is $48.69 (sweet spot $15–$100). The average incumbent carries 3,003 reviews — the moat a new listing must climb.