How big is your pond and have you got a filter system set up?
I have a small pond which is natural, full of plants and stays crystal clear on its own with no help, the fish seem fine and all water samples come out fine.
I have another small pond with bigger fish and hardly any plants, this always had a filter system running but when it started going green too often I purchased a small UV unit which makes the green algae clump up so it can get caught in the filter.
I am now in the process of building a 3500 gallon pond, this went very very green but once I installed the 55w UV lamp and filter system the water was clear after about a week.
So in my experiance if you can, get a UV lamp running on a filter system to clear your green water problem. But make sure it is the correct size for the pond, if its too small it will not clear the water and if it is too big you will waste money buying it and running it.
I am in the process of building a new pond and have been given lots of decent sized plants. The only problem is they float, I cant remember the name of the plants but they are tall and have yellow flowers.
I have weighed the plants down with large stones but now worried it may be limestone which I gather is bad for fish or maybe its sandstone?
Does anyone know how I could identify it?
Maybe when I get home I could post pic's for you guys too look at :D
My mother and stepdad have a massive pond full of fish, they have a Heron in there almost every day sometimes two. You can tell when the Herons have been as they leave an oil slick on the water. The fish have plenty of places to hide and most survive, unfortunatly a few years ago a Heron managed to bring the KHV virus to the pond which killed loads of the fish.
This thread has already helped as one idea was to put netting on the pond, but I had not thought about frogs being able to get in and out of the pond. So thanks for pointing that out :)
One thing I was thinking about was wooden posts with thick rope draped between them, bit like the ropes you wait by at the cinema. but getting the perfect height would be pretty important.
I will try and get some photo's of the pond put here soon :)