I have a indoor basil potted plant in an office environment and over the weekend holes appeared on the surface of the soil, as if something dug them. The pots are next to a window, but it's closed at the weekends.
A few times I've I noticed cockroaches in the bathroom, but it's 10-20 feet away and the office is locked and the door is well sealed. It's an old building, I can see some holes in the ceiling, where the pipes are.
Do cockroaches like to dig holes in potted planets, or could it be something else? And how do i get rid of it / them?
Click below images to enlarge...