Congrats! Once they start poping it doesn't seem to take long before you have to start expanding the operation! I get to go home and build and plumb 2 more racks after the first as our colony is growing fast. 3 mothers with pups and one that should have all her girls weaned this weekend. We are over 50 rats now between breeders and pups and have two more expecting mothers plus another 2 tubs of 3 females in with males. Our overall goal is to get to 12 full colonies of 18 females each by the end of the year!