I had some rams and they are aggressive. My mated pair ---the male killed the female and then the eggs hatched. One baby systematically killed all his siblings. His name was Brutus and he lived for 9 years in a 10 gallon tank by himself--he would kill anything I put in. He also loved snails, my dd and I would crush them and he would eat them from our hand. He also could recognize us. When she left and came for a visit a year later , he came right out to see her. All in all he was a great pet!