I could use some advice on moss species. What is best for carpeting the ground, epiphytic on driftwood and climbing the background walls? Java Moss appears to be a favorite on this board for its striking color, but is expensive and looks to come in only small packages making it difficult for my large tank. Contrarily I hear very little about fern moss which can be found in gallon bags. Does anyone use it? What about Riccia or Pillow? Do Dart Frogs have preferences which species they prefer? Any suggestions are much appreciated.