algea question, again

[27goldfish]

Okay, I am getting algea. But it seems to only be appearing on the rocks in the waterfall. Any ideas? Here is a Pic:


http://s160.photobucket.com/albums/t181/blackabbydog/?action=view&current=Picture.jpg

 

[27goldfish]

got more pics without the water flowing:

http://s160.photobucket.com/albums/t181/blackabbydog/?action=view&current=Picture001-2.jpg

http://s160.photobucket.com/albums/t181/blackabbydog/?action=view&current=Picture002-3.jpg

http://s160.photobucket.com/albums/t181/blackabbydog/?action=view&current=Picture003-4.jpg

http://s160.photobucket.com/albums/t181/blackabbydog/?action=view&current=Picture004-2.jpg

I get the stuff in the last picture every year, and was told it was normal.

 

[lindsayanng]

thats completely normal and probably beneficial to your pond. the rocks on a waterfall actually act as a filter to your pond. They grow bacteria that eats the bad stuff in your pond and keeps your water clean..

You basically cant have natural things in a pond like rocks and logs and not have some algae.

its when you have the algae that makes your pond ugly like the string algae or the green floating algae that makes your water green.. algae on the liner, rocks, or other things is compeltely normal