ripped

Hi, so I went out of town a couple months ago for a month or so and when I came back, my betta's tail was completely shredded. The top of his anal fin is ripped off and the bottom half is split down the middle and just all together Shredded. My first thought (after checking that it wasnt fin...

I need help on what to do now. I found my female guppy hanging at the top of the aquarium with all her fry hanging out and her stomach open. Do I euthanize her? Do I save her fry somehow? Can she heal from this?   Has anyone ever had this before and does someone know what happened?