I was in Petsmart today, where in my area, they usually don't have the best bettas, and I don't even glance at them, but I happened to spot a betta that was exactly what I've been looking for. I had a betta years ago that I was in love with, he was a completely red double tail with fins that faded into transparent white. In Petsmart they happened to have a halfmoon double tail boy with fins just like this. He doesn't look great though. He seemed more alive than the other bettas there, but he was still laying on his side quite a bit in the bowl. I figured he'd have a significantly bigger chance surviving with me than if I just left him there to die in that cup though, so I'm giving him a chance. Normally I would never consider buying a fish that doesn't look very healthy, but since he's in a tank by himself, he can't pass anything onto another fish, and if he doesn't make it, I can get my money back from the store (though I'll be sad). His fins look perfectly fine though, no sign of fin rot, so there's a plus for him! He's breathing and moving his fins, and he swam away when I tried to take pictures (ha), and I'll be keeping his water very clean to give him the best chance at making a recovery.