You have to bait ants...the only way to kill the colony is to kill the queen. Yes, spray will kill the few you see but not the hundreds you don't see (yet). I suggest you follow their trail and put ant traps down. They will take the poison back to the colony and kill them all off. This is also the least risky to your animals. ANY spray will kill your T's so be very careful if someone is spraying around them...even in attached room.