I have recently added some reconstituted moss to my FBt and Tree frog enclosures (about 2-3 wks ago). I have JUST noticed (about 6 hours ago) itty bitty little bugs (knats?) Not sure if they came in the moss or with something else. Are they harmful to the frogs/toads or just an eye sore to me? If I need to get rid of them, HOW!?