More Information about Koi
Ideal Conditions
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Neutral, modrately hard. One of the most tolerant fish species. They will survive in almost any water condition or temperature. Providing the pond deep enough, the koi will live through most winter.
Water
Temperature
10-24C 50-75F
Floating and sinking koi pellets, fresh orange and lettuce,prawns, earthworms
Food
Minimum number
3 but preferably 6 
Tank Region
top, middle,and bottom
The powerful as possible
Filtrations
Aeration
Is needed to keep them healthy
PH Conditions 7.0 to11.0
Ideal Tank
Koi are ideal for a large, deep pond.
Minimum depth of pond
120cm (4 ft.)
Koi are ideal for a large deep pond of 10,000 liters(2,200 gallons) or more.  They can be kept in smaller ponds but soon will outgrow them.
Pond size
Koi are social fish and do not worry mixing it with other fish, although very small fish may be eaten accidentally when the koi are surface feeding, as they cannot see infront of their mouths.
Compatibility