Question about my BD hybrid

I just got my hybrid not to long ago, and she is beautiful! Unfortunately she is a wickedly mean *****!!!! I guess my question to everyone, is if you have ever brought a new ray into your setup, that already has larger, established, rays in there, and the new ray just starts to assert its dominance as soon as it's dropped in? This little gem swam over to my largest ray, as soon as I dumped her in, and got on top of him and looked like she was nipping at his eyes. Now I have not seen any damage done to my other rays, and there is a pup in there, but she has killed some large fish that were in the aquarium before her. She kills them and just plays with them for a bit and swims away. Has anyone seen behavior like this before? I want to add new fish to my tank, but I am pretty sure she will kill them, and unfortunately, she is not goin anywhere. Thanks

It's like nothing I've ever seen! Usually when I bring a new ray home and put them in, they tend to stay away from the other rays and usually don't feed right away. Not this one, I was told that she was fed primarily market shrimp, I feed worms, so I was expecting to have to get some shrimp for her, nope, the second the worms hit the water she was all over them. So, I guess in a way, that was a good thing.