There are two different types of glass tanks: standard aquarium-style, and Ant-Store style. Standard aquarium tanks have thick silicone beads at the joints, and escape prevention coatings like Fluon won't stick to silicone. Ant-Store style tanks, which only ship in Europe, are not designed to hold water, so they are not made with the thick silicone bead at the joint, allowing Fluon to be applied to the rim on the side walls.
In either case, you also want to ensure you have a proper lid. When using Fluon, ventilation is critical, because Fluon fails irreversibly in humidity starting at about 45%, non-condensing. A fine mesh screen works to allow air in, and keep ants contained, but often you need to custom-build the frame for this part, because few manufacturers make lids for glass tanks that are compatible with ants.
Edited by drtrmiller, June 14 2018 - 9:29 AM.