Glad to see one of my favorite species of ants coming to this game. I love to observe these pretty ladies in my terrarium. I think the bridges is a good idea, but fire ants are really known for their painful sting. Maybe you could make it to where when the fire ants sting it causes a reduction in defense, aggression, or maybe even confusion like the coach horse does. And maybe you could make them cheaper than most other ants because of the shear amount of Ants this species can produce. Just a suggestion.