We're about to set up our own rat feeder system & I thought I'd throw you lot some curly questions. We have bought 2 females & 1 male, currently kept together in a 4ft tank but we'll separate the girls from the boy soon. 2 girls will share a 3ft tank & the boy will have a 2 ft tank to himself. The young will be removed at 4 weeks from mum & grown in the 4 ft tank till D-Day. Is that housing adequate? How many rats does 1 gas cylinder deal with? What is the ideal size for the gassing box? Does anyone who is doing it have any tips for us? That will do for starters though I'm sure there will be more, lol