i had a j.d. that beat up oscars, cons, b parrots, granted i got him from a guy who did the "right" thing and got "rid" of him because he was just plain nasty, but i thought with my experience and numerous tanks i could settle him and introduce him to one of my communities...... i was wrong, he was ultra aggresive and viscious rather than pass him on, or create a species tank which i could have i didnt beleve he was a true example of a j.d. ive had j.d. that lived with oscars peacfully for years but anyhow i fed that monster not to my jag but my rbp, that jd stood his ground but not for to long, he had finally met his match! mean fish meets meaner fish! i could have dropped in the jag tank but that would have been cruel!