The best way I have ever seen to control Fire Ants that is almost 100% effective is to treat with a mix of AmdroPro and Extinguish a 50/ 50 mix treated twice a year. This has kept my place in South Florida ant free for 9 years. Both products are also almost 100% safe for your animals. They do not make the grass or other forage plants toxic. The primary way that they work is as a growth regulator. I have had no problems using these products around my tortoises and Cyclura. This is also very affordable as both products are relatively inexpensive. I hope that this helps. Best wishes Douglas Beard / Flora & Fauna