Well, now that I think about it, anything with Solenopsis molesta would work. The molesta can stay hidden, and they won't kill the other colony because they want to snack on their brood. However, if two colonies were to be raised together, I think they ideal choice for the other colony would be Tetramorium, as they'd be able to keep up with the molesta's growth, and won't suffer terribly if some of their brood goes missing........
Edited by AntsDakota, July 6 2020 - 4:16 PM.