Whats the deal with ponds
I went to clean my aunts pond out for her today. it is a good 200 - 300L pond. I started by emptying the pond. I found the water at the bottom so dirty that it was almost black. Unfourtunately the birds had discovered that the fish made tasty treats and there were only two fish left both 8 - 10cm and black. One fantail and one normal. There were also a load of pond snails which had algae growing on their shells and looked like japanese moss balls.
I scrubbed the sides until no algae was to be seen and then rinsed it out again. I then filled it. The Fish were in a bucket (she insisted that they could handle) They were gapping at the surface so i tried to cool them down by floating the bucke in the pond. We then sorted out the plants. The Oxygen weed, chinese ivy (Cardamine) i think :-? and the Lillies. We potted them and set them up. The pump was broken and this ussually runs a sponge filter. She didnt want ot put a net over it to stop the birds.
The problem is this. In a few weeks time it will probably be starting to go back to the way it was. So how do people keep the pond with a limited amount of algae? Do you do water changes every few weeks to clean out the detrius so it doesnt have a chance to break down break down or do you use algae killing products.
Please share the light