Today I took my Koi out of the tank because my Pacu was bitting his fins off. And my Koi has killed both my FL Gar. So I traded my Koi for a green terror and now my Pacu is going nuts. Not too sure what is going on with him. Maybe just the tank mate change has him stressed out, he is running about the tak slamming the sides. Any ideas? The koi and Pacu were best buddies raised together as well as my gar RIP. Well both are dead now tommorrow I am getting a 12 inch gar for 20 bucks.