Is it possible to use the deep litter method over a vinyl coop floor? If I can't how often should I completely change the bedding? I have been racking it weekly and removing the majority under the roosts. I have not smelled amonia, but I don't like the smell, I am sure you know what I mean. I am confused as I have read several books that say not to clean it too often as it could be detrimental. Any advice?