What happened :(

[Sidman24]

One of my bettas was found dead this morning.. I noticed some weird "goo" coming out of where she poops on her body... Could it have been parasites or is this normal?? I noticed the night before she was hovering at the surface of the water.. I don't understand what happened here is a picture of her body to try to see..

 

[Sidman24]

Anyone?

 

[ALelk]

Do you know what your water parameters were at? Tank size? Stuff inside tank? Any odd behavior before their passing? How long have you had the fish?