This is my pond i have a livestock farm in india i decided to rise a koi farm in future so i bought 6 japanese koi each of them are 5 to 7 inches so i dig the pond in my existing farm but there is no mud in this pond iss that any problem the size of the pond is 15'x10'x2' and i wrap the pond with nets,i put them in this pond i feed them saki hikari high growth and hikari spirulina i don't know whether it is too small or okay so tell me can i keep 6 more koi fishes in this pond i like to mention one thing this is a temporary pond i plan to move them to a separate farm but it will take some time