Would it be ok to use pumice as a drainage layer? Its lighter than gravel and porous... They sell bags of it for cheap where I live. Also, I bought two really neat bromeliads that are planted in some volcanic rock. The rock planter came from crater lake in Oregon. Its never been exposed to pesticides or anything like that... Would the plants inside die because the volcanic rock stays moist and that touches their roots? Or could this hurt the frogs? Thanks a bunch!!!!!


