sudden trouble with my new fish..

Hi,just recently i bought an indonesian tigerfish.he is 11 cm long.i thought he will be okay with my fish since the only fish i have is mild temper fish and in the shop,the shopkeeper put him with bunch of ocellaris,frontosa,and leporinus.but as soon i put mi IT in my tank,my 14 cm frontosa started to push and chasing him around.what should i do about these?are these kind of behaviour are common and will disappear over time?