I have four of these colonies left, all living in starter formicariums. About two months ago, the largest colony's queen died, so I took what I thought was a dud queen (she wasn't laying any eggs) from one of the test tubes, and added her to the colony. I turned the temperature up in my fridge, and put them in there to cool them off. I left them in there for an hour or so, then took them out. As they warmed up, they started fighting with the queen, so I put them back in again. I don't remember exactly how much longer I left them in, but eventually they were not as aggressive. The queen and the workers did not seem to get a long very well, but they were not trying to kill each other. After a few days, the queen was in the nest with them and they all looked happy. Amazingly, this queen then started laying lots of eggs, and now the colony is continuing to grow larger.
Right now the colony sizes are 8, 18, 20, and 22 workers.