I planted my 2 vfts and my pitcher plant in a 10 gallon fish tank with glass over the top (left a gap for air) and placed it in my window. when I planted them I put them in with their original soil and added some peat moss aroung it and then put a bunch of rocks in there, now there is white web looking stuff starting to grow all in it, does anyone know what it is and how to get rid of it?