| Definitely get him a buddy and then do some covert observation to see if they start hanging together. Also, you may want to chop up some food (if it’s floating) so that some sinks and the newbies will have a chance to eat too if they’re not coming up to the surface to eat.
I’m not sure of your set-up and how many koi it could comfortably handle taking into account their mature size with the other species in your pond, but if possible you may consider getting one or two more koi after that if everything goes well. The koi I’ve observed seem more nervous if they’re in a group under 4.
One more thing - it really is best to quarantine any new fish for a minimum of 6 weeks or more before you add them to your established population in the pond.
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