I am getting concerned about my new Cardinal fish. ABout a week ago, I noticed he is developing a 'bulldog' mouth. I have two and they both were healthy upon introduction. The other is fine and still has a normal shaped jaw, but my'sick' one's jaw appears swollen. I have noticed he does not act like the other Cardinal and he does not eat as much or as vigorously. I have done a quick google search and found nothing and the search function on this forum is not working. Can someone give me some advice on if I have a problem and wha I should do to fix it?
Thanks.
Thanks.