Köi-Lö wrote:
Even with shade from the lilies and other plants on the south side of
the ponds the water is now 84F to 86F. One older koi developed
"dropsy" and died, but probably not from the heat. Last summer the
water went into the 90s. The filters need weekly cleanings even with
the use of the expensive koi food.

21.15 here in London UK, water temp is 76 deg. Fish seem quite happy, in
fact, very playfull.
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ßôyþëtë