Well from what I can see hes got the Cambodian Light-bodied cut off to darker-finned, and he appears to have that band of Butterfly-white...so looks like a Cambo-Butterfly to me! xD Lol, you're very welcome, glad to help.
My boy is in my Avvy, though heres a better full-bodied picture of him:
The flash plays off his iridescence a little more and he has some fin damage(I assume from biting in that tiny petstore cup), but he has the very faintest bits of butterfly going on. xD Not that I'd call mine a butterfly, but he looks like he came from a butterfly spawn.
Just a little similar to your guy. xD
Lol, I can't tell if mine is a full HM either....can't get him to flare for me at all. xD
Ahh, the joys of petstore finds....I just love when I walk in and find a gem among all the reds and blues in that terrible blue water in those little cups. <3