guppy shaking

[EliotVilla]

hey, how are you? i'd like some help, my guppy has been like this since sunday, he was put in the container because i noticed he was missing his left finn and his tail, he was doing fine until sunday when he started acting like this. additionally today i noticed this white spot on the side of my molly, is it ich? is the reason for my guppy to act that way? i also include my parameters. Thanks

Guppy video
https://youtu.be/gV-oSBxKEvQ

molly video:

https://youtu.be/gGKyyFaHPjk

parameters:

ph 7.4
ammonia: 0 ppm
nitrite: 0 ppm
nitrate: 20 ppm