I used to have two red blood parrots, but i started out with one, and when we bought its mouth was crooked. Then we bought another one with the same problem, unfortunately though it was too small for our aggressive tank and is passed away. One day my mom comes home with and even bigger parrot than the one we had remaining. It however was perfectly fine. I just went and put feeder goldfish in and realized that now it too is developing a crooked mouth. Is this common, a mutation, or possibly a disease?