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Koi like people can get bored with the same food served up constantly. I think the use of live food and different food peaks their interest and is a good practice for a better balanced diet. Because living food can carry health problems with them, I would hope the worms you use have been raised under your control and are purged. All the pike and shrimp need to be handled carefully. Since they are from salt water, things they carry should not be transferrable to a fresh water host. You might want to consider watermellon or lettuce
which are popular in other places. When introducing new food remember sometimes it take the koi time to get used to it or aquire the taste.
as in most things in life i think everything in MODERATION makes the most sense!
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