There can be several reasons why ants are in your succulent soil, but often it is because they are "farming" other insects as a food source. If the plant doesn’t give or is difficult for you to pull it out, it has probably rooted. You can also use food-grade diatomaceous clay (DE) to top your soil. This will kill larvae and adults who come in contact. Graptopetalums are yellow-pink if grown in full sunshine. In shade, they will be bluish brown. Exposure to bright light causes the plant's teeth to turn deep purple.