30 gallon fish tank
Skip itPrices mostly outside the sweet spot ($18.64–$2431.46) — this niche doesn't clear our bar today.
Quality gap
Great4.1★avg incumbent rating — lower means beatable quality
Competition
Good52%top-5 click share — leaders hold, buyers still browse
Review moat
Good1,397.76avg incumbent reviews — the moat a new listing must climb
Avg price
Okay$210.54avg listing price — sweet spot $15–$100
Brand share
Okay83%top-5 brand share — brands hold most of the demand
Returns
Okay5.1%return rate — above 6% kills the launch gate
Market size
Okay$112K$112K/yr · 124K searches
Growth
Bad-4.6%90-day search growth — must beat 0% to launch
Conversion
Bad0.4%search→purchase rate — share of searches ending in a sale
Price range
Bad$18.64–$2431.46cheapest to priciest tracked listing — scored on the share inside $15–$100
According to Flapen's Amazon United States niche tracking, 30 gallon fish tank is a $112K/yr Amazon United States market (124K searches/yr). The top 5 brands hold 83% of demand. Demand peaks in Jan–Dec. Verdict: Skip it — 37/100.
Data updated Jul 17, 2026 · scored weekly · How we score niches
30 gallon fish tank market data
- Units sold / yr
- 250–500
- avg 0–100/product
- Revenue / yr
- $53K–$105K
- units × avg price
- Launch success
- 50%
- 6 of 12 new (360d)
- Conversion rate
- 0.4%
- Avg BSR
- #115
- Page quality
- 0%
- Prime
- 93%
- Sponsored
- 66%
- Out of stock
- 19.6%
- Avg brand age
- 36 months
- Avg seller age
- 167 days
Competition & brand share
The top 5 products take 52% of clicks — established leaders, but buyers still shop beyond them.Brands
17 flat
Sellers
23
Top-5 brand share
83%
Top 20: 100%
Top-5 click share
52%
Top 20: 91%
Open market
15%
- Tetra40%
- Aqueon19%
- COOSPIDER10%
- GloFish7%
- SubstrateSource7%
- CLBA3%
- Open — no brand owns it (11 brands, 15%)
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -4.6% search growth over the last 90 days.Peak months: Jan, Dec · busiest ÷ quietest = 2.2×
Top 30 gallon fish tank search terms
- 20 gallon aquarium63K/yr
- aquarium 20 gallon11K/yr
- 20 gallon aquarium kit12K/yr
- fish tank 20+ gallon9K/yr
- 20 gallon tall fish tank6K/yr
- huge fish tank4K/yr
- 10 gallon acrylic aquarium4K/yr
- aquariums 20 gallon5K/yr
- aquarium large3K/yr
- aquarium tank 20 gallon2K/yr
Top 30 gallon 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.
All 29 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Tetra Aquarium 20 Gallon Complete Tropical Fish Tank Kit With LED Lighting And Decor For Freshwater Fish
Tetra$123.284.3★3,796 rev
Tetra ColorFusion Aquarium 20 Gallon Fish Tank Kit Includes LED Lighting and Decor
Tetra$132.904.3★3,796 rev
Coospider 20 Gallon Glass Fish Tank Aquarium Starter Kit Simple Self-Cleaning Aquarium with 3-Color LED Lights with Quiet Filter Pump with Temperature Monitoring for Fish Shrimp Kids Gift Ideas
COOSPIDER$185.203.8★196 rev
Aqueon Aquarium Starter Kit with Smart Clean Filtration and LED Lighting Freshwater and Saltwater Fish 20-Gallon
Aqueon$179.134.3★2,482 rev
Tetra Glass Aquarium 29 Gallons Rectangular Fish Tank
Tetra$131.164.6★998 rev
Newest
by launch date
Aqueon Glass 20 Gallon Long Tank for Aquariums & Terrariums
Aqueon$87.320 rev
Aqueon Standard Glass Rectangle Aquarium Tank 20 Gallon High Fish Tank High-Clarity Glass Construction Freshwater & Saltwater Compatible Black Trim 25 x 13.25 x 17.25
Aqueon$95.090 rev
20 Gallon Fish Tank Smart Aquarium Kit Glass Small Aquarium Starter Kits Self Cleaning with 3 Types of LED Lights and Filter Water Pump Water Temperature Detection Ultra Quiet Gift for Kid
TARARIUM$197.131 rev
20-29 Gallon Fish Tank Stand Aquarium Stand with Power Outlet Heavy-Duty Reptile Terrarium Stand Table with Top Shelf for 20 Gal Long/High/Extra Long & 29 Gal 30.7L x 15.3W x 30H (Black)
Rymeera$86.9182 rev
20 Gallon Glass Fish Tank Standard Aquarium Fish Tank Rimless Low Iron Aquarium for Betta/Turtle/Goldfish/Snails/Shrimp and Aquatic Planting
CLBA$197.808 rev
Trending
90-day click momentum20-29 Gallon Fish Tank Stand Aquarium Stand with Power Outlet Heavy-Duty Reptile Terrarium Stand Table with Top Shelf for 20 Gal Long/High/Extra Long & 29 Gal 30.7L x 15.3W x 30H (Black)
Rymeera$86.914.6★
Coospider 20 Gallon Glass Fish Tank Aquarium Starter Kit Simple Self-Cleaning Aquarium with 3-Color LED Lights with Quiet Filter Pump with Temperature Monitoring for Fish Shrimp Kids Gift Ideas
COOSPIDER$185.203.8★
Aqueon Glass 20 Gallon Long Tank for Aquariums & Terrariums
Aqueon$87.320.0★
AQUA DAREN 15 Gallon Rimless Aquarium Fish Tank Ultra-Clear Nano Glass Rectangular Fish Tank L19.6W13H13.8 Thickness 6mm Glass Aquarium (L 15 Gallons)
AQUA DAREN$94.504.8★
Aqueon Standard Glass Rectangle Aquarium Tank 20 Gallon High Fish Tank High-Clarity Glass Construction Freshwater & Saltwater Compatible Black Trim 25 x 13.25 x 17.25
Aqueon$95.090.0★
What buyers say about 30 gallon fish tank
What buyers praise and complain about, mined from review topics.What buyers love
“High quality tank”
“Great Value”
“the filter works really well”
“Great size”
“The look is superb”
“As expected”
“Solid construction”
“Easy to take on”
“Nice thick glass and well sealed”
“the instructions are clear”
What buyers complain about
“Not a great filter”
“It simply broke”
“Leaks”
“poor instructions”
“Horrible quality”
“wrong size”
“The lowest setting won't move the water at all, the medium setting isn't even a trickle, and the highest”
“hard to put together”
“The pictures are kind of misleading”
“The adhesive is very weak”
Top return reasons
Common questions
- Is 30 gallon fish tank profitable to sell on Amazon United States?
- The niche generates $112K/yr across 29 tracked products. 6 of 12 products launched in the last 360 days are still selling. 90-day search growth is -4.6%. Flapen's verdict: Skip it (37/100).
- How competitive is the 30 gallon fish tank niche?
- 17 brands and 23 sellers compete. The top 5 products take 52% of clicks and top 5 brands hold 83% of demand.
- What do buyers complain about in 30 gallon fish tank?
- Top complaints mined from reviews: Filtration, Durability, Leak-Proof. The return rate is 5.1%.
- When does demand for 30 gallon fish tank peak?
- Demand peaks in Jan–Dec; the busiest month runs 2.2× the quietest.
- What does it cost to enter the 30 gallon fish tank niche?
- Listings span $18.64–$2431.46; the average listing price is $210.54 (sweet spot $15–$100). The average incumbent carries 1,398 reviews — the moat a new listing must climb.