wiggle worm castings right now. not sure what silver thing you speak of. vpd (vapor pressure deficiency) is a fancy name for humidity problems. i had way low humidity for a minute there. put in a fogger and much better now.What kind of ewc do you use? I enjoyed you journal, Great big girls you ended up with! What was that one silver thing in a pic couple back and what is the thing you were having probs with Vfd? or something whats that?