I have had my new Schefflera bonsai recieving indirect sunlight on a dresser. I try to leave the window open every day so that it can get a breeze and more fresh air. Recently however, for the past 2 days I've woken up to find white fluff on the soil. I can easily remove it with my finger, might it be some kind of mold?
It's been raining outdoors for the past few days so I wasn't sure if the humidity would help or hinder, so I kept the window closed. I purchased the plant not too long ago, and when I got it (3 days ago), it was dripping wet, so I haven't watered it yet.