I think my plant is having trouble, but I am not sure if it is bugs. I just watered it today; put it in a bowl of water (we don't do this often), so it could take as much water as it needed, and when I took it out the soil had white stuff on it and I could have sworn I saw a bug in it. What is that white stuff? (Just on the soil, not the plant), and i am not sure even if I saw a bug, it was very, very, very small and greyish-white. Could the white stuff have been from overwatering. This is my first time taking care of dieffenbachia and I just need to know if what I am doing is wrong. Anyone know what it is or what I should do about it? If so that would be very good.