Are these pests or am I being paranoid? I bought this beautiful Primulina ‘Loki’ this week and have been keeping it isolated for now but am curious if the sandy/ grainy speckles on the leaf stems are pests or not? There aren’t any on the other areas of the leaves and kind of seem like sand. They don’t exactly seem like they are pests but I want to be extra sure before I introduce it to the rest of my household plant family. Any ideas? Thanks!