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@eskay
My pond is well established, loads of plants, 5 fish, always have frog spawn and there are a few newts but I have no pump or filtration. I think it has just naturally stabilised and the water is always clear.
It is important to not feed your fish if you have plants, they get enough food from the plants. Feeding them makes them grow quicker but also creates more fish 'waste' which upsets the balance (according to a fish expert I spoke to ages ago)