Question about freezing fish...

[Feral]

Some arctic species do have a genetic ability to survive sub freezing temps (cell walls rupture as cellular water becomes ice crystals and expand) but Bettas would not have this. Your Bettas internal structure is now mush.

Sorry for your loss, but I think you chose well- freezing to death is believed to be painless, maybe even pleasant past a certain point if you can believe human accounts.

[Hankbetta]

Thank you :)