Was going to post a pic of my Betta fish Oscar, but HOW can i compete with that! Stunning
Beautiful colours on himBest I can do I do prefer my Pure White Betta mind but you asked for colour..
You need to set your shutter speed as fast as your camera will allow, and set your ISO as high as you can without it getting grainy (try starting at 400 and go up or down from there) you will also need to set your aperture to let enough light in (since you have a fast shutter speed there isn't much time for light to enter the camera so you'll have to tweak the aperture so enough gets in). This is a setting that you'll just have to play with to see what works. I have to use a different aperture setting for taking pictures in different parts of my tank