hmm it does look a lot like a zonatus . It could explain why its beginning to become hyper aggressive and its massive growth rate in the last 6 months. Ill try to take better pictures . Its hard with a phone ! haha. . It had a bar going across its body for a long long time and was not as thick as it is now. Like I said within the last 6 months it has put on some serious girth and length. and now im starting to think this fish is not a coatz because the black bar running vertically across its body is completely gone and its starting to have more of the photo above features .