John wrote:
My pond goldfish are dying. Possible causes?

? The heat
? Filling up pond with tap water after evaporation due to heat
? Clearing out plants clogging the pond
? Disturbing sediment, including submerged rotting leaves.
? Scooping off duckweed with metal sieve
? Cherries falling into pond from nearby tree

The water seems not to have properly settled since the plant thinning,
and to be a bit murky

All the other posts are correct. Is this a small fairly shallow pond?
Is it filtered?
For topping up, I use an 80 litre plastic box from B & Q, fitted with a
water butt tap. I add dechlorinator, then fill with hose on a spray setting.
Let it stand 24 hours, then trickled feed into pond via a length of hose.
Try and shade the pond from the sun if possible.
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