Grats, he looks really beautiful and yeah it is good to see him in a large tank since most people think bettas do better in small cups but it is really good that you have him in a big tank because that will keep him happy all the time, just remember to keep up on your water changes!
I'm glad it's going to be in a big tank, I saw a "fin pals betta keeper" online and bought it because it was like $3, it got here, and it holds 24 oz - its less than double the size of the cups the petsmart bettas come in!