Question: do betta fish need big tanks?
Answer: The ideal sized tank for a betta is 5 gallons or larger for a single male or female betta. ... In a tank smaller than 5 gallons, your betta won't live out his full life span. In an aquarium, a betta should live for 3 to 5 years. In a cramped 2.5-gallon tank, your betta won't live as long.