My male and female rats for breeding in a 20 gal tub have a good life with a wheel and nice hide and tunnel and eating almonds and cheese and scraps. I do no not consider them pets only for feeding my pythons (4 normal's) and these rats love to fight i think the first week i got them they fought every night when the lights go out. Not a single bite mark or scratch so will they eventually drawl blood? These are a new pair of rats i have breed rats before and never seen them so active.