Beautiful color, Lin.
I un-potted a couple of 30" fiddle leaf ficus this morning to package them up for shipping, and one of those pots was loaded with ants. I think they are what we call "sugar-ants". Anyway, they are small, black and don't sting/bite. I sprinkled a little bit of Orthene on the root-ball and lightly moistened the potting soil. This quickly either chases the ants away or kills them. I have never seen a plant damaged by Orthene.