a coulpe years ago I had set a big rock on a shelf to dry out and kill off the brown Paly's (2-3 months) when I got it down they where all dryed up and dusty I set it in my sump. I know now that was very bad thing to do. my tank crashed and me and my english bulldog got very sick I felt all the things listed here I made it but my dog didn't
so keep pets away also.