Hi. I currently have 5 tiny Israeli Commets in my 23x18x3.5ft deep pond (approximate size). I am going to buy 4 10" Koi today. In order to prevent spawning and over-crowding is it suggested I only buy 4 males or is that unhealthy to the fish? I heard 3 males and 1 female can be detrimental to the female during mating and that sounds logical to me. Any advice will be appreciated