Let me get this strait
So even though they eat ants, the explosion of fire ants is causing their demise. Haven't seen a horned toad (the mascot of TCU), around these parts in years.
So what you are saying is that they eat native ants, but not fire ants, and fire ants are displacing the native ants?
Only cure I've found for keeping them out of the house is to find out where they are coming from outside and get rid of them there.
There are some thorny decorative bushes out there where they come from. Either I cut them down, or get a big ouchy.