this is my forth letal seedling caused by unknown problems ,i have few of sativa planted organics left on attic after another 3 are eating by rats 2 weeks ago, i guess,because ,they are ruined and mess up around the dirt , but the other one are just like being cut at the lower stem this morning,although i put a fence suround the pot,and seem nothing big animal near it,any explanation?any ants or bug could did it .oooh im so devastated.now i have to germ it again and again.