To make a long story short i had been talking about starting a colony, and my "helpful" brother overheard the comments i was making. He went to work and a guy he works with keeps snakes and he bought 2 feeders, the snakes went off feed for 2 months and he ended up with 2 litters totaling 18 babies. I now have 4 of the fairly small rats. Unknown to me they were coming home tonight, and i purchased a med/large rat to feed this evening (and my snake wouldn't eat). Now comes the part I need help with, I don't have anything set up for them and they are in the small carriers(4 small ones in one and the large in another). Can i keep them effectively in a spare 18 gallon tote? i also have a 55 gal. aquarium that is empty if that would be better. I don't know much about rats yet, but am i correct that i have to keep the larger one separate from the smaller ones? All help is appreciated