Yes, the moss is an indicator to me that all is well in the watering department! There is also a tiny seedling Paph micranthum that has been living there for more than a year now. It was going downhill fast, had lost it's roots and in desperation I stuck it into the moss, having heard or read that live moss is the best 'life support' for rootless orchids, and this Phrag had such nice moss. Well, it didn't die, and is actually now slowly putting out a new leaf!