curved spine

Help, my female betta was attacked by a rainbow shark and she isn't swimming, her spine is curved in a S shape when she tries to swim. I put her in the shrimp tank so she can eat live worms from the bottom of the tank and some shrimp, (the tank is overpopulated by shrimp so don't judge me), I...

I got some glowfish danios yesterday and they were doing great last night and this morning, however when i got home from work all 3 have downward curved spines (U shaped) and look slightly bloated (bellies look boxy). They are swimming perfectly fine and super active. None of my other fish are...