unknown fish

Hey everyone, this is my baby boy Nova. My husband and I got him as a baby with no color except stripes from Petco on a whim, I've had many types of fish during my life but never a Betta. I've done hours and hours of researching, and can't seem to figure out what he is, now that he's growing...

Hi there! We just got three new Betta and they were unmarked at the pet store. We were wondering if you could tell us what they are! Also, we have one that we still aren't sure what he is, either! But before you say anything about the pictures: They were all taken either BEFORE we took them out...