hello all! so im a first time fish owner,im loving it so far

kinda mad that the fish store forgot to tell me tiger barbs are bullies if they are in small packs

so now my new platinum green barb is getting beat up on alot and im not sure what to do.i have 2 barbs(1 blushing tiger barb.,1 platinum green tiger barb) ,2 albino buenos aires tetras ,and one un known little orange and black dood.this is a 29 gallon tank and things are good so far except the poor little green one is not looking to good from being chased none stop for a couple hours now.well im told not to get more than 5 for now just to be safe....so ill stick with these guys for now if they all life,maybe get a pleco when the tank is ready.what should i do about this tiger barb being a bully???