New oscar has clamped fin after 2 days, help!

I recently added a 2" Oscar to my tank.. when i got him from my LFS, his fins and tail where a little nicked up (typical) , day one he ate alittle and chased around a little.. now day 2 i notice his fins/tail looking alittle more beat up , as well as 1 of his fins being clamped and he just hanging around at the top of the tank.. i took him out of my big tank and put him in my smaller one, (much less aggressive fish) hoping the fin clamp is just part of stress and nothing more.. i dont see any white spots or anything..

The water is fine.. 7.5 ph - 0 amm 0 no2 10 ppm no3 ... Tank mates are bigger and a little aggressive , (oscar gt ..) which is why I removed him . Thinking it may be bullied.. I am just worried he is sick.. But I do to see spots on him.. Could he act this way if bullied? Or does it usually mean sickness?

Temp is 80'

I can't get a good pic but he definitely has some nicks on his tail and fins but I know when I bought him 2 says ago he looked alittle nicked... I'm not seeing spots ..

Yeah that's what Ill do, I am just hoping it's not anything more then that. Wish I could take a clearer pic! I'll try anyways .. And thanks a lot for the advise! Appreciate it!