Pigmy chain sword reproduction

Hello all,
  I recently bought my first pigmy chain sword from the local fish 
store.  It has runners extending out from the crown of the plant which 
terminate in "nodes."  The nodes have several short runners extending out 
from them which have little balls on the end.  There are several of these 
constructs on each of the plants.
  Are these nodes going to develop into more little plants?  I have 
experience with vegetative propagation of valisneria, but I am confused 
because the Val. always put the runners out beneath the substrate and I 
only had to observe the finished results.  Should I wait for some root 
structure to develop on these runners and push the plantlets into the 
substrate?  Or do I need to do anything else?

  Thanks for the help.