| Taking koi photos We use a square 4'x4' fiberglass tank 16" deep with around 10" of water. The size of the tank allows fish to relax very quickly. The shape, as others have said, encourages the fish to swim in a straight line. With a larger than usual tank, fish will much more often swim down the middle.
A couple more things about the camera. As already mentioned, a polarizing filter is a must. ALWAYS use a flash; if enough natural light is present, set the flash for "fill in".
As we tend to use screens to cut off the hard light causing glare, the tank will be relatively dark. One thing I found over time is to "help" the camera make the right decision about lighting (flash). Check the flash modes available with your camera and select the mode that measures the lighting requirement ONLY on the subject (as opposed to averaging for the whole frame). This technique will avoid over-exposure of the koi itself.
Hope this helps,
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Arthur
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