If you've chosen the fish for fighting purposes then I cannot commend this, however if you are simply mixed up in their names then that's fine. Betta Fish often called Siamese Fighting Fish are definitely not referred to as their latter name lol, since fighting animals like that is illegal it's just easier to call them Betta fish.
He is a cute boy, he's a blue Veiltail (VT) and looks young, maybe 4 months if 5. The tank is nice but I say a few more taller plants around it. Betta's come from rice paddies and like lots of cover, they can become nervous and scared in a place with lots of opening's in it, regardless the size of tank. But overall looks nice