ok...I know this topic has been done to death but have to ask so that I am sure I understand. Java fern must<?> be attached to an object (driftwood or rocks) to grow properly. The best way to attach it is to tie it on with thin fishing line. Soooooo How big does the rock have to be? How long does it take to attach itself to the point I can move it without fear of pulling it off the rock? Thanks Elaine