Can a betta live in 1 gallon tank?

While it is possible to keep a betta fish in a one-gallon tank, it is generally not recommended as it can be too small and can cause health problems for the fish. Betta fish are territorial and prefer to have their own territory, and a one-gallon tank does not provide enough space for them to explore and swim comfortably. They may become stressed or bored, leading to health issues such as fin rot, tail-biting, and general weakness.

It's always better to provide them with a tank of at least 5 gallons or larger to ensure their happiness and overall well-being.