yes of course! my betta is in a 2.5g and is perfectly fine
you can put a betta in a 5 gallon tank
A betta fish would be much more suited to a 1 gallon tank than a 'variety'. You shouldn't keep much more than one fish per gallon anyway.
A 1 gallon tank could have one betta fish, but you will need to be diligent about changing the water on a regular basis. The smallest tank that should be used, even for a betta, is a 2.5 gallon tank as it at least gives the fish swimming room.
None are recommended if the Betta is a male.
Go fish
Any.
No
Yes.
Only 1. Usually a Betta is all that is kept in a 3 gallon tank
i have a half gallon bowl for my betta fish and he has plenty of room
betta fish like at least a 1 gallon tank (nothing smaller) > They can live in a community tank but with no other bettas.
get a 5+ gallon heated and filtered tank