Do you have a picture of your rat?I have mice and a rat i use my males as feeder for my rat but decided to spare this ones life as he has two different eyesView attachment 2472482. You can see my rats nose in the background but decided to keep this one so he was added to a colony of females as i have way to many males but a few look to pretty to use as a feeder i have a 55g tank eith a colony a 20g with a colony and spare cages for extra males and females