I’m a beginner in the plant world, but I got this succulent about a week ago and it’s got this dusty look to its leaves as well as some brown spots on them as shown in photos. I’ve seen a couple gnat-like bugs on/around the plant and I’m just not sure if it’s got some sort of pest or not. Thoughts? And advice what I should do if that is the case? I’m not too keen on the idea of using insecticides…