Hello! I have two bug eating plants I have been growing for a little over two months, Ones a venues fly trap and another is a pintchure (I forget what type..) I brought them in side in the begging of October because it started to get very cold. There soil is never too wet. This morning I woke up to find a brown mushroom in the potting soil. I was wondering why it grew there ? is it harmful to my plants ? How can I stop another from growing..