I’ve dabbled in photography I’m not great at it but I do know what you mean and I got that banding issue when I took shots of my tank under fluorescent lights never really got rid of it but did my best to diffuse the light from the fluorescent lights. Haven’t had that issue since I went to LED lights
Might be your issue might not be
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 My aquarium is nothing but a smorgasbord for my cats.....
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