Dear All, I am new to all this but need some expert help. Couple of years ago were sold two 'petracola's', which are 4-5" long and I now think they are Syndonoti Polli. Recently they have started fighting - well one chases the other and is biting his fin. How do I stop them or will I have to get rid of one of them. Please let me know asap. Briscy 
