When i was lookin at my fish tank and couldt find my male krib. i found him stuck under an ordment. i got him out but he didt look rite. At 1st i thought it could be the shock but the male and female dont go round together. I found that the male was only using his left front fin ( by the gil) however i seen him use his right one once. And now hes just goes somewhere to hide and stays there ( he swims at a slight angle)
Seriously, there isn't too much you can do for him. As long as no other fish are bothering him I'd just leave him alone and hope for the best - the chance are he'll heal on his own as long as nothing is interfering.