I just found out that my red eye tetra's are dying one by one. Last night i just found one in one of my orange head mouth. This orange head used to be the dominant for a long time, however, after being demoted to sub alpha he became crazy and acting more aggressive. Can anyone help me find a way to stop him from eating my tetra's because the same tetra's were living with him for 2 years ever since i bought him when he was 2 inches long.