hes alright with them he would mess with them though if i dont feed him for a week.. when i first got him i introduced him as a community fish lol since then no death casualty its the other way around the pacu would always nipp his fins but then again nothing serious, hes been with the kois for 5 weeks now hehe! no scales detached
He ll be fine with his tank mates (oscars i can vouch for) ... CK i am not so sure. After seen miguel's CK in gar mouths. My pacus were killed off (don't know who). Cool pond in any case. Good luck