Please observe the koi carefully in a koi quarantine tank for 14-21 days to see if it develops any problems.
If you do not have the filtration system, please make partial water change every 2-3 days (about 25%). Add salt accordingly.
Feed digestible food to your koi every day such as Manda Fu.
Check Ammonia and nitrite every day. If you find Ammonia, use Ultimate.
Read all the details of koi care after receiving in your home.