There is fuzzy growth or mold in my terrarium. What do I do?
This is a sign that you are over-watering your terrarium. Carefully clean the mold off the leaves or soil and remove it from the terrarium. Is the terrarium getting enough natural light? Move it to a brighter area (although out of the rays of the sun, if it is a woodland terrarium). Refrain from watering the terrarium until the soil dries. Keep a close eye on how long this takes. Once the terrarium needs a drink, focus you watering on each plant and make sure not to flood or over-saturate the terrain. Now, let the terrarium soil dry to the touch and recalibrate your watering schedule to reflect this drying time.