Small Fish Tank Market Report: Sales Volume, Market Share, Leading Brands & Market Trends
Small Fish Tank sales on Amazon US totaled 40,600 units in July 2026 (▲ 17.3% vs. the prior month), generating an estimated $1,067,437 in revenue across the 50 top-ranked ASINs for this search term. Demand is heavily concentrated at the top of the ranking — the ten best performers capture 73.9% of unit volume and 54.8% of revenue, while a typical listing is priced at $43.81. The keyword itself pulled 20,728 Amazon queries over the same period (▲ 13.0% MoM).
Zooming out to the 12-month window ending July 2026, the small fish tank Top 50 moved 382,350 units and $10,013,888 in cumulative sales — an average of 31,863 units and $834,491 per month. Monthly throughput topped out at 40,600 units in July 2026 and dipped to 22,150 in May 2026, leaving the latest reading 25.3% higher than August 2025.
Small Fish Tank Sales Trend (Trailing 12 Months)
Based on the top 50 ASINs by monthly sales for this keyword
2025/08
2025/09
2025/10
2025/11
2025/12
2026/01
2026/02
2026/03
2026/04
2026/05
2026/06
2026/07
Monthly Sales 2026/07
40.6K
▲ 17.3% MoM
Monthly Revenue 2026/07
$1.1M
▲ 20.0% MoM
Top 10 Market Share 2026/07
73.9%
Small Fish Tank Market Share & Sales Concentration on Amazon US — July 2026
The most-sold small fish tank listing on Amazon US in July 2026 is ASIN B091D3DTWS (Brand: Tetra), which sold 8,000 units at $10.29 apiece — equal to 19.7% of every unit tracked in this report and 14% ahead of the No. 2 listing.
The Top 10 ASINs account for 30,000 units and $584,970 in July 2026 — 73.9% of unit volume and 54.8% of revenue among all 50 ranked ASINs in this report.
Sales Volume of Top ASINs for 'Small Fish Tank' on Amazon
July 2026
Is 73.9% Top 10 share highly concentrated?
Ask AI to evaluate competition, market structure, and entry opportunities using ’s tracked Amazon sales, ranking, and keyword data.
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Top 5 Volume Share breakdown
B091D3DTWS
Tetra Water Cleaner Gravel Siphon for Aquariums Up to 55 Gal | Makes Water Changes Easier, Removes Debris From Gravel, Remove 30% Of Water Every 30 Days
8K
▲ 0.0%vs. prior month
$82.3K
latest month
12-month trend
B00JMABYUO
Fluval 12694 Plant and Shrimp Stratum for Freshwater Fish Tanks, 8.8 lbs. | Aquarium Substrate for Strong Plant Growth, Supports Neutral to Slightly Acidic pH
7K
▼ 12.5%vs. prior month
$127.9K
latest month
12-month trend
B0GGTJCVR5
BITZEE Aquarium Interactive Fish Tank Toy & Digital Pet, Ages 5+ | Nurture 30 Virtual Fish, Reacts to Touch, Customize with LED Lights, Screen-Free Responsive Play, Birthday Gift for Kids
4K
▲ 900.0%vs. prior month
$160K
latest month
12-month trend
B0BGG7Z3N9
hygger Small Aquarium Betta Heater, Submersible Fish Tank Heater 10W/25W/50W/100W with LED Digital Display, Suitable for Marine Saltwater and Freshwater up to 5/10/16/26 Gallon
3K
▲ 50.0%vs. prior month
$49.6K
latest month
12-month trend
B0002DHYF4
Tetra Whisper 85 GPH Internal Power Filter For Aquariums | For Fish Tanks Up To 10 Gallons, Whisper Quiet, Space-Saving Internal Filter Clips on Tank
3K
▲ 0.0%vs. prior month
$47.9K
latest month
12-month trend
B06XHSJ8MV
Tetra Whisper IQ Power Filter 10 Gallons, 105 GPH, with Stay Clean Technology
1K
vs. prior month
$20K
latest month
12-month trend
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Best Small Fish Tank Brands on Amazon US — Top 3 Brand Sales Concentration (July 2026)
Tetra is the best-performing small fish tank brand in July 2026, moving 12,000 units across 3 ASINs for 40.0% of Top 10 volume. Fluval follows with 7,000 units (23.3%), ahead of BITZEE on 4,000 units (13.3%).
With 7 brands splitting the Top 10 and 76.7% of volume sitting with three of them, this is a concentrated shelf — the leaders hold multiple listings or one very high-velocity ASIN, so a new entrant competes against established review moats rather than an open field. Average selling prices among the leaders run from $15.41 to $39.99, which frames the price band a competing listing has to justify.
Brand share of Top 10 volume
Tetra
3 ASINs in Top 10
40.0%
Units
12K
Revenue
$150.2K
Avg. price
$15.41
B091D3DTWS
$10.29·★4.5·5.2K revsTetra Water Cleaner Gravel Siphon for Aquariums Up to 55 Gal | Makes Water Changes Easier, Removes Debris From Gravel, Remove 30% Of Water Every 30 Days
Units sold8KB0002DHYF4
$15.97·★4.2·22.6K revsTetra Whisper 85 GPH Internal Power Filter For Aquariums | For Fish Tanks Up To 10 Gallons, Whisper Quiet, Space-Saving Internal Filter Clips on Tank
Units sold3KB06XHSJ8MV
$19.97·★4.2·14K revsTetra Whisper IQ Power Filter 10 Gallons, 105 GPH, with Stay Clean Technology
Units sold1K
Fluval
1 ASIN in Top 10
23.3%
Units
7K
Revenue
$127.9K
Avg. price
$16.99
B00JMABYUO
$16.99·★4.7·18.2K revsFluval 12694 Plant and Shrimp Stratum for Freshwater Fish Tanks, 8.8 lbs. | Aquarium Substrate for Strong Plant Growth, Supports Neutral to Slightly Acidic pH
Units sold7K
BITZEE
1 ASIN in Top 10
13.3%
Units
4K
Revenue
$160K
Avg. price
$39.99
B0GGTJCVR5
$39.99·★3.9·173 revsBITZEE Aquarium Interactive Fish Tank Toy & Digital Pet, Ages 5+ | Nurture 30 Virtual Fish, Reacts to Touch, Customize with LED Lights, Screen-Free Responsive Play, Birthday Gift for Kids
Units sold4K
Trending Small Fish Tank Products — Growth Leaders & New Top 10 Entrants
Based on July 2026 data, this shortlist surfaces the two kinds of ASIN worth keeping an eye on — the ones that just broke into the Top 10, and the ones growing fastest month over month. Specifically, 3 ASINs forced its way in: B0GGTJCVR5 booked 4K units at $39.99, with ▲ 900.0% MoM change.
The two signals carry different weight. A fresh entrant means share has already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date. A steep growth rate works as the earlier warning: it marks demand that is still compounding, usually a month or two before the ranking catches up to it.
B0GGTJCVR5
BITZEE Aquarium Interactive Fish Tank Toy & Digital Pet, Ages 5+ | Nurture 30 Virtual Fish, Reacts to Touch, Customize with LED Lights, Screen-Free Responsive Play, Birthday Gift for Kids
Price
$39.99
Rating
3.9
Reviews
173
Latest month sales
B06XHSJ8MV
Tetra Whisper IQ Power Filter 10 Gallons, 105 GPH, with Stay Clean Technology
Price
$19.97
Rating
4.2
Reviews
14K
Latest month sales
B000256DXG
Exo Terra Faunarium, Plastic Reptile Terrarium, Medium, PT2260
Unlock to view ASIN details and product titles
Price
$14.99
Rating
4.0
Reviews
7.2K
Latest month sales
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