I found a mushroom spore sprouting out of the soil in my oregano container that i keep in my grow box with my other plants. This is the only container that has one and it has been covered by a ziploc bag with one hole punched in it for ventilation. Is this a good or bad thing for my other plants in there? Ive had similar mushrooms grow in the containers of plants outside but never any indoors. Should i be worried?