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You need to get an aerator going ASAP, or a small cheap pump recirculating water. 3 koi in 700 gallons and pump being off for a couple days already is not good.
I suggest you also do small water changes, adding something like "Pond Prime" by Seachem, to bind the ammonia.
I suggest you also do small water changes, adding something like "Pond Prime" by Seachem, to bind the ammonia.