Injured swim bladder?
I recently purchased two peppered cory's. One of them disappeared for a while then was found floating at the surface with bloody cuts either side I'm assuming he got stuck somehow. I thought he was dead but he swam down to the bottom. I added aquarium salt and the wounds have healed however he's still floating or lying on the bottom on his side with small periods of normal swimming / scavenging. I wonder if he's damaged internally and would appreciate any advice,