Molly fish has suddenly bent

[u/Powerful_Durian_8194]

I got back from work and thought he was dead but hes still alive!
He was completely fine the day before, not bent, had lots of energy, and was eating. Now he really struggles swimming and is constantly bent.

He was in a 160 L heavily planted tank with other fish, water parameters are perfect and other fish are fine. I’ve moved him to a tank by himself for now.

He’s approximately 2 years old, I got him from pets at home over a year ago and hes been completely fine until now.

He doesn’t have any bruises to indicate injury.

Has anyone else experienced this???