Go down to,"something strange happening to my new terrarium" same problem with a couple of easy fixes, please read the posting carefully, the answer was literally under your nose! =)

theres no bugs and the webbing is on the soil and rocks, and more thin than those pics, but maybe it is a fungus or mold or something, I'll try a lil more air flow

Yeah, its prob that stringy "other worldly" looking mold/fungus, I had it in one of my set ups and a little stronger circulation took care of it, just watch your humidity =)

When you put it in the window, the sun created too much condensation, so either leave the top off altogether or get it out of the window.