i just added a 5" JD to my 125 with 2 oscars of the same size. he is constantly chasing them off. wont let them come anywhere near his 2/3rds of the tank and sometimes goes over to their 3rd and chases them just for catching a glimpse of them. one of the os is beat up pretty bad. i think im gonna need to take him out until the oscars outgrow him by a couple inches. it makes me want to punch him in the gills