cory can't swim right

[Sgooosh]

Hello, suddenly today, one of my "green " cories from petsmart is acting very strange
today i just found him near the filter upside down and he looks totally fine. any idea what happened? will post photos asap
thanks

 

[connorlindeman]

what are you feeding them? i had a similar problem that i believe was caused by a number of issues including a improper diet.

 

[Sgooosh]

what are you feeding them? i had a similar problem that i believe was caused by a number of issues including a improper diet.

hikari micro pellet hikari fancy guppy omega one bottom feeder food