Associate Professor Alistair Poore appeared on Channel 7 News on 19 September 2014  to explain the strange appearance of green algal balls on Dee Why beach

https://au.news.yahoo.com/video/watch/25061870/what-is-going-on-at-dee-why/

 

Also have a look at these

Pictures of the algal ball festival with mascot at http://shrineodreams.wordpress.com/2012/08/11/marimo/

and a song at http://www.youtube.com/watch?v=ejcWydndQuw