I'm not familiar with that camera but the basics are the same with any camera.
It looks like you're using a flash - don't. You'll get a much more natural picture with only your tank lights on and the room lights off.
Turn off all the pumps too before taking a picture.
To prevent blurriness use a tripod as well as shutter delay.
If it is a point-and-shoot, use macro mode.
Play with as many settings as possible while shooting exactly the same picture. One of the most important settings is White Balance. Learn how to adjust it on your camera to adapt to your aquarium lighting, which often confuses cameras because it is so blue relative to sunlight.
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