I had a new plant that I got at Walmart, but it got damaged so I cut off most of the leaves to try to grow some from cuttings and to "start over" the new plant. It's in a mixture of perlite and vermiculite. I just repotted it yesterday because I had it in a dixie cup, which, after a few weeks, was starting to look bad. So I put it in the plastic container it originally came in. Today I picked out 3 mushrooms that seemed to spring up out of nowhere. Only once before did I have a mushroom in there. What do I do about this?