Betta Tank Size Guide

Enter the available space on your furniture and we will recommend the best tank size for your betta.

Your Available Space

Tank Size Comparison for Bettas

Feature5 Gallon10 Gallon20 Gallon Long
Dimensions16" x 8" x 10"20" x 10" x 12"30" x 12" x 12"
Weight (filled)62 lbs filled111 lbs filled225 lbs filled
Pros
  • Fits on a desk or dresser
  • Easy to maintain
  • Affordable entry point
  • Room for a few tankmates
  • More stable water parameters
  • Easier to heat consistently
  • Best for betta community tank
  • Very stable parameters
  • Beautiful planted tank potential
Cons
  • No tankmates besides snails/shrimp
  • Requires more frequent water changes
  • Needs a sturdy stand
  • Slightly higher upfront cost
  • Requires dedicated stand
  • More equipment cost
  • Takes up more space

Recommended Tanks

Aqueon 10 Gallon Tank

$

Great 10 gallon option for a betta setup.

★ 4.7Check Price on Amazon →

Aqueon 20 Gallon Long

$

Great 20 gallon long option for a betta setup.

★ 4.6Check Price on Amazon →

Frequently Asked Questions

Can a betta live in a 1-gallon tank?

No. A 1-gallon tank is far too small for a betta. It cannot maintain stable temperature or water quality. The absolute minimum is 5 gallons, and 10 gallons is ideal.

Do bettas need a heater?

Yes. Bettas are tropical fish that need water between 76-82°F. Unless your room stays consistently in that range, a heater is essential.

Is a 5 or 10 gallon tank better for a betta?

A 10-gallon tank is better if you have the space. It provides more stable water parameters, more room for your betta to explore, and the option to add a few compatible tankmates.

How much does a betta tank weigh when full?

Water weighs about 8.34 lbs per gallon. A 5-gallon tank weighs about 62 lbs filled, a 10-gallon about 111 lbs, and a 20-gallon about 225 lbs. Make sure your furniture can support the weight.