I added a siamese male fighter to my 30 ltr biorb just over a week ago. He was very aggressive towards my pearl danio, nipping his fins. I thought that by adding 2 females to the tank, my male fighter would leave the danio alone. well, now he is terrorising the poor females and the danio. the females are hiding away behind plants but have damage to their fins. any suggestions on how to get this bully to calm down? is he just being very territorial?