Algae that grows on surfaces is called
substrate algae and comes in a bunch of
different kinds. It helps clean the water
and feed the fish when they shouldn't
be eating much of anything except for
plant matter. You can't have a pond without
it. Mother Nature will not stand for it! Algae
is one of the basic building blocks of the
food chain and will not be denied its rightful
place ;-)
On the other hand string algae and free floating
algae is okay to mess with. Keep
substrate algae around and it will help
keep string algae and free floating algae down.


ka30p
http://www.geocities.com/watergarden...dors/home.html