clown acting strange

[Chase31]

I got to occilaris clowns on thursday and the whole time hes been acting strange he was swimming near the top not moving and on the bottom sort of going sidways then correcting himself, totally diffrent then my other clown. i sort of shook it off and thought maybe he needs to get use to the tank. currently only two clowns two blue/green chromis and a royal gramma. no one is bullying him including the larger(maybe not sure yet) female. as of yesterday he started breathing sort of fast and hasn't been off the bottom since. not sure if this is swim bladder or not, should i give him a few more days or should i take him back to the LFS where they may be able to treat him???

Thanks