JAva moss or xmass moss or singapore moss or many other types of moss are great for breeding fish they for perfect fry hide outs and grazing areas for smaller species. they also are great for shrimp who forrage arround for detrius and algae
they can be attached to almos anything. alot of people attache it to corks and let it float and create floating plants. other tie it to wood, rocks, cocnut shells, or ornaments and wait for it to encrust itself on.
if you use the plastic needle point mesh you can create a moss wall that forms a unique and attractive backdrop or decoration. It is easily grown and maintained in almost any condition so long as fish can inhabit the water.
often times the java moss will not appear to be doing much growing after being attached a month or two... once the java moss anchors itself it will begin to grow much more rapidly, like most plants or animals acclimation may take some time but once it is set in it will flourish.