Thanks for the reply.
I found these little creatures inside the pond filter ( the pressurised type ) lately. As I cleaned the filter every week, I removed them every week.
This may indicate something is changing in the water chemistry. The pond used to have dark sheeting above it, but the sheetings were replaced with lighter colour ones lately allowing more light to come through. As a result the pond water has a bit more green algae showing up. My main concern is whether these bugs are harmful to the fish or not.
Any comments would be appreciated.
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