Hi! Brand new plant parent here. I have 3 pothos, a Manjula, Golden and a Snow Queen. All 3 have developed this mold-looking substance on the top of their soil. What am I doing wrong for this to happen? How do I fix it? I've attached photos of all 3. None are in pots with drainage holes, because of this I make sure the soil is entirely dry before watering them again. They're about 3.5ft from a window where they get bright indirect light almost all day. They're all not even 3 weeks old, to me. I also use a natural pesticide spray that I've attached a photo of too.



