I'm trying to get a bromeliad to root on a piece of "ghostbood." I'm wondering if its safe to use a rubberband to hold some wet sphagnum moss and the brom to the wood. I plan on taking the rubber band off before putting any frogs in the tank. Is there any reason I should worry about rubber bands releasing any strange chemicals? Is it safe to put the frogs in there before I take the rubber bands out even? Seems like a silly question, but I'm always a little nervous putting seemingly "normal" items into a vivarium.