Advice needed

Sorry for the poor video but one of my clowns is acting weird. It was acting normal yesterday, but today it hasn’t moved from this area too much. I checked the parameters and they were all at healthy levels. It lives with another clown and a sharp nose puffer in a 55. I haven’t noticed any aggression from the puffer but the clowns fins look torn. Could it be the other clown that’s stressing it?