Okay so I have about 15 clones rooted and growing all of them between 8-12" tall. Over the past couple days when the light s have turned off I have gone into the grow room and noticed entire shoots have been chewed off (through the stem) and are laying next to the plant. Also on random leaves there are chunks missing. I have been through a few grows before and have handled many pests but I can't seem to find anything that suggests what it could be. There's nothing flying in the room, nothing in the soil, nothing anywhere! Any suggestions as to what it could be?