betta fins go white when they are healing. The thing about albino bettas is that they are backwards when it comes together, sure you can find a white bodied one but you'll soner find a redish one because the skin is so white it's almost clear and you can see the blood underneath. I wouldn't get too scared he might have been rubbing on the glass or what not and may have bruised his fins. Thats about all i can say without a pic. If you can get one post one and I'll take a look.