I brought home two adolescent males from a pet store on Monday. I am guessing they are a month old. The smaller, less aggressive one (Master Splinter) is perfect. Cuddly, calm, affectionate, well behaved. But his brother (Professor Ratigan) is hyper and bossy. He's much bigger than Splinter and, while he is tame and obviously hand raised, he is just very pushy and aggressive. When I first brought him home he was very calm. Since he has been getting outs and treats he has taken on this greedy personality and has become antisocial and only interested in treats and outs. And he'll grab all the fruit or veggies I put out, hide them under the file cabinet, then go hangout under the couch alone. When I pick him up he digs at my fingers to put him back down. But Splinter chills out and will even jump back in the cage all by himself, or onto my lap (or my 5yr old daughter's lap). Should I take away treats until he shows better behavior? He's not stressed. He's just being a brat. He is playful with his brother and never stops eating. Should I give him less outs or confine him to a smaller space? He's already a little chubby so I want him to run. I have had mice, hampsters, and rabbits but this is my first time owning rats. I can't find the information I'm looking for on the internet. :/