Will a Betta fish attack other fish in the same tank?

Usually Yes

I had a 30 gallon fish tank with 5 neon tetras, 4 cardinal tetras, 3 zebra daniOS, 2 sWordtails, a dwarf gourami, a bunch of ghost shrimp, an otto catfish, and a red betta.

The betta didn't pick on any of the other fish, even the neons and ghost shrimp. It was highly peaceful and had quite an appetite.(Not to mention cute

As long as all the other fish

a. Are not long finned

b. Reasonably quick

c. Don't look like a betta(like guppies)

and the tank is

a. Large(like mine)

b. Not overcrowded

c. Well planted and filtered

The betta will be happy and get along fine with all the other fish