This is a discussion on Attaching java ferns within the Aquarium Plants forums, part of the Freshwater Fish and Aquariums category; -->
I just got a few java ferns and since i have no thread or fishing wire i just used the lead band things to ...
While it may be argued as to how fast it will occur, the lead will leech into the aquarium. Lead is a toxic metal, so I would remove the lead band.
I usually wedge part of the rhizome into a crevice in the rock or wood. If you need something else, ordinary thread or even string will work, provided it is not coated string but plain cotton. Once the rhizome is attached (this takes a few weeks probably, I've never checked it) the string could be cut off.