If you go to the video section look up Crazy Dovii and you will see how aggressive he is...Also he is alone in a 120Tall because he will tolerate no tankmates. As far as diet he eats Krill in the morning-Hikara Gold for lunch and Beefheart for dinner..........He was aquired from Jeff Rapps about 13 months ago when he was only 2"...........Thanks for all your comments.