Yeah. I've a white n blue male, but when the light hits him right, he shine blue-violet.
And my red boy Raph has iridescence too. Kind of pale blue-violet, kinda golden. Looks like he has Ich (I think that's the one with the shining stuff) half the time, but the flecks of it like that are only on his tail, and been there since I got him.
You need to try to make your dad understand that it's AMAZING those two boys haven't killed each other yet. Because, really, Rose looks like a boy, probably hung around with his sisters when he was little, and the idiot pet store people thought he was a girl because he was still small and female-looking. xD
I mean, if you can, get him to research bettas. Seriously.
Be sure and tell your dad that Betta do have teeth and thats how they can take chucks out of each other and kill . Maybe he never thought of of it like that before . You just never know when they will start to fight, my guy who lives alone goes wild when he sees the blue lid on his jar of food...lol
Raph used to kill everything. Even managed a pair of pond snails. xD
Took him a week for the first one, and the second snuck on his side, and well. Yeah. End of the snails. XD
They are extremely aggressive, and males will also kill females (and vice-versa). Sororities can even turn bad after weeks of calm-ness. But that's rarer.
Ask him, would he rather dead fish, or happy fish?