yes but it would need a heater as they are both tropical fish and you would need to change the water alot.
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.
2 or 3
None are recommended if the Betta is a male.
Go fish
No
Any.
Yes.
yes of course! my betta is in a 2.5g and is perfectly fine
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