orange/brown slime in pond ...help!
We have a stream that runs into a largish pond and out again through the bottom of our garden. It has been getting orange/brown sludge that will spread if undisturbed. This can be broken up with a rake and dispersed but it returns a few days later. The main source seems to be 2 drainage pipes that run from our garden but it also gathers around the edges of the pond that aren't near the pipes. I am a total novice (its our first home and first ever garden) so I don't want to do anything that will disturb the fish in the stream, but I also don't want to leave it incase it is doing damage to the pond. I am guessing it is a form or iron bacteria but I can't find any information about what to do about it. Does anyone know if I need to treat it or is it harmless to the wildlife?