Bruce it is a type of FA.

Welcome JHM to the PB forum. Some additional info may help us all to give input. What part of the country are you in and what are your soil/water conditions?
Here is a link on FA including water net and one on FA from TAMU.

http://plants.ifas.ufl.edu/guide/2algae.html

http://aquaplant.tamu.edu/database/algae/filamentous_algae_mgmt.htm

And look at this PB post for a possible idea if your conditions warrant. But be careful if you decide to try it.

http://www.pondboss.com/ubb/ultimatebb.php?ubb=get_topic;f=14;t=000228;p=1#000000