I have some sphagnum moss that's from the Zoo Med brand and labled as "terrarium moss." The box claims it's okay for frogs and toads and it gets good reviews, but some people online have said sphagnum moss is unsafe because of impaction risk. so is it safe or not? If it's not safe, then what kind of moss is safe, and where can I find it? I'm having a hard time keeping the humidity high enough this summer!