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My wildlife pond has a rusty slighty oily brown colour water near the surface this hasn't happened before ,there is still a frog in there & plenty of pond snails what has caused this & do I need to do something ?
Plant remains, leaves, bud cases and so on, breaking down and releasing whatever it is they have in there. Don't empty, it will sort eventually if you've got a good balance of plants. If the fogs aren't worried you needn't be