Yeah, Phillipe knows what he's talking about. If you take about a month to set up a substrate, you can actually make it self sustaining and it will decompose the frogs feces and use it as plant nutrients. It takes alot of time and effort to make a substrate bioactive but well worth it. You don't need to clean it out for about six months. I have the Rhacodactylus book that contains a little info about naturalistic vivaria, that was 40$ well spent. Even has his autograph

. If you want to learn exactly how to do it, I would buy the book that Whitelips reccommended. You will really get a lot out of any de Vosjoli book you read.