Then the effect you get is known as false colouration.
Moreover, it is easier to do it as a post processing job. Just shift the red or green in photoshop.
Another easier way is to use cellophane paper to wrap your flash. Even easier. COnfirm super red.
My personal opinion is that, the true colour of the fish should always be presented so that people who do not know of the fish are not misled into thinking that all fishes should be that kind of colour.
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