What size tank do most betta keepers actually use?

Across 542 real betta tanks in the AquaGauge dataset (July 2026), the median is 10 gallons. 32% run a 5-gallon, 29% a 10-gallon, and 92% are 5 gallons or larger. But 8% still keep a betta under 5 gallons, below the modern minimum.

What pH do betta tanks run?

Across 104 real betta tanks that posted a pH reading, the median is 7.4 and 81% sit between pH 7.0 and 8.0 — slightly alkaline, not the neutral 7.0 often quoted for bettas.

What temperature do betta keepers run?

Across 70 real betta tanks that reported a temperature, the median is 79°F, with the middle half between 78 and 80°F — squarely in the tropical range a betta needs.

What is a normal nitrate level in a betta tank?

Across 123 real betta tanks that posted a nitrate reading, the median is 5 ppm and 93% read 20 ppm or lower. Median ammonia reads 0 ppm across 125 tanks.

Betta Fish Statistics 2026

July 3, 2026 · 3 min read

Betta fish statistics in 2026: Key data and insights

Across 542 real betta tanks in the AquaGauge dataset, the median tank is 10 gallons, 32% are 5-gallon, and 8% are still under 5 gallons. Median pH is 7.4 and median nitrate 5 ppm. Real numbers on how betta keepers actually set up, from 542 tanks posted to public forums.

Key betta statistics (July 2026)

Each line is a complete, sourced statistic. Copy them freely; how to cite this page.

The median betta tank is 10 gallons, across 542 real betta tanks in the AquaGauge dataset (July 2026), and 92% are 5 gallons or larger.
32% of betta keepers run a 5-gallon and 29% a 10-gallon, across 542 real betta tanks in the AquaGauge dataset (July 2026); the two sizes together account for most tanks.
8% still keep a betta under 5 gallons, across 542 real betta tanks in the AquaGauge dataset (July 2026), below the modern minimum but far short of the old cup-and-bowl norm.
The median betta-tank pH is 7.4, and 81% read between pH 7.0 and 8.0, across 104 real betta tanks in the AquaGauge dataset (July 2026).
The median betta-tank temperature is 79°F, across 70 real betta tanks in the AquaGauge dataset (July 2026).
The median betta-tank nitrate is 5 ppm, and 93% read 20 ppm or lower, across 123 real betta tanks in the AquaGauge dataset (July 2026).

Tank size: the 10-gallon is the real betta standard

Across 542 real betta tanks in the AquaGauge dataset (July 2026), the median tank is 10 gallons. The distribution tells the fuller story: 32% run a 5-gallon, 29% a 10-gallon, and 26% go above 10 gallons. Put together, 92% keep a betta in 5 gallons or more, and 74% in 10 gallons or less.

That is a real correction from the cup-and-bowl era bettas are still sold into. But the floor has not vanished: 8% of these tanks are under 5 gallons, below the minimum most current care sheets push. The median keeper has moved past the myth that a betta thrives in a vase; a stubborn minority has not.

Water: slightly alkaline, and cleaner than the horror stories

Betta tanks track the wider hobby: they run slightly alkaline, not neutral. Median pH is 7.4 across 104 real betta tanks in the AquaGauge dataset, with 81% between pH 7.0 and 8.0. Chasing a tank down to a “perfect” neutral 7.0 usually causes more stress than the pH itself.

Temperature sits where a tropical fish needs it: median 79°F across 70 tanks, with the middle half between 78 and 80°F. On the nitrogen cycle, betta tanks read clean: median nitrate is 5 ppm across 123 tanks, 93% at or below 20 ppm, and median ammonia reads 0 ppm across 125 tanks. As with every AquaGauge figure, the clean median reflects well-run tanks; the scary outliers are keepers who posted precisely because something was wrong.

How to cite this page

Cite these figures as: “AquaGauge Betta Fish Statistics 2026, theaquagauge.com/betta-statistics/ (July 2026 snapshot, 542 real betta tanks).” The aggregate statistics are licensed CC BY 4.0: use them freely, with attribution; a link back is appreciated. Download the full dataset from the Aquarium Statistics pillar.

Methodology

These numbers are computed directly from the AquaGauge real-tank dataset: betta tanks posted to r/bettafish, with each measure calculated only over the tanks that reported it (542 stated a size, 104 a pH, 70 a temperature). They come from keepers who chose to post, so read the clean medians as the real hobby and the alarming outliers as the help queue. This page is maintained by Yevhen Bulhakov, editor of AquaGauge. Read more about how we collect the data, or see the full Aquarium Statistics pillar.

FAQ

What size tank do most betta keepers actually use?: Across 542 real betta tanks in the AquaGauge dataset (July 2026), the median is 10 gallons. 32% run a 5-gallon, 29% a 10-gallon, and 92% are 5 gallons or larger. But 8% still keep a betta under 5 gallons, below the modern minimum.
What pH do betta tanks run?: Across 104 real betta tanks that posted a pH reading, the median is 7.4 and 81% sit between pH 7.0 and 8.0 — slightly alkaline, not the neutral 7.0 often quoted for bettas.
What temperature do betta keepers run?: Across 70 real betta tanks that reported a temperature, the median is 79°F, with the middle half between 78 and 80°F — squarely in the tropical range a betta needs.
What is a normal nitrate level in a betta tank?: Across 123 real betta tanks that posted a nitrate reading, the median is 5 ppm and 93% read 20 ppm or lower. Median ammonia reads 0 ppm across 125 tanks.

By Yevhen Bulhakov. Guidance is general — confirm for your species and water.
Freshwater aquarist of 8+ years.