Update 7-20-2013Ok, so I put all three test tubes together in a container and opened them up.

Right away they all started to mingle, and then a few of the workers started to grab each other and appear to be fighting. I put three termites in there for them, and the colony on the left which seemed to have slightly larger workers dragged all three of them into their tube.

I went to work, and when I got home, I found the colony on the left again, stealing all the brood from the colony next to them. Soon they had every last brood from that colony added to their brood pile. I also noticed a few of their workers harassing that colony's queen too. Small fights here and there were still breaking out amongst the workers. At this point I decided to remove the third colony (the one on the right), and keep it separate, since it hadn't been disturbed too much yet. I think they had a couple brood stolen from them, but that was it. A little later the second colony's queen was dead; the first colony's workers killed her.

After this, I noticed something interesting; all the workers stopped fighting and I never saw a fight happen again. Eventually all the ants from the first and second colony moved into the first colony's test tube, and at that point, I took them out of the container and put them back with the rest of my test tube colonies. Now I have two colonies of Solenopsis molesta, one small, and one much larger; not exactly what I was hoping to get out of this, but it's probably better that way, I have way too many colonies of ants as it is.