The two reasons I suggested giving back the JD is because it was stated that the O was his favorite fish. Also, since the JD was bother the Jag as well, it's also a good idea to just get rid of the problem fish or house him by himself. I can't count the number of times I've had to take overly aggressive fish to the LFS in order to maintain a somewhat stable community. Thankfully my LFS gives me credit 