The green on the sides of the ponds is good. It acts as part of the
filtration system. It consumes the nutrients that feed the green water.
Limit water changes to about 10% per week and wait. Patience is the real
cure for green water.
--
RichToyBox
http://www.geocities.com/richtoybox/pondintro.html

wrote in message
ups.com...
I have a pond with some assorted fish and a few plants. Every couple of
weeks though, the water and the walls of the pond turn green. Can
anybody tell me why and how to fix it?