crushed by rock gold fish

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my son droped a rock in our koi pond and it landed on one of our fish he is all brused up and looks like it may be 6the end is there any thing we can do its been 3 days

[PokoFish]

Hm, I would need more details about the fish....

How big was the rock? How big is the fish?
How is he swimming?
Does he have any cuts or open wounds? Is he bleeding?
How has he been over the 3 days? Has he improved at all?