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As Sean suggested, adjusting the camera's white balance setting is the best way to get your colors to look more natural. If your camera doesn't have a good white balance adjuster you can do it post op in Photoshop or the like.
What you can do is take a reference picture of the tank with a known white and black object stuck into it. Anything non-toxic and waterproof will do. I've used white plastic knives (the disposable kind for picnics), and a black tray from a CD jewelcase. It's important that these objects be well lit by the tank's lights.
Once you have this reference picture you'd set the white and black levels based on the white and black objects. In Photoshop this would involve the Levels function. I don't have Paintshop Pro so I don't know how it's done there. Write down the values for these points and apply them to photos taken without the objects. This should get you in the ballpark.
What you can do is take a reference picture of the tank with a known white and black object stuck into it. Anything non-toxic and waterproof will do. I've used white plastic knives (the disposable kind for picnics), and a black tray from a CD jewelcase. It's important that these objects be well lit by the tank's lights.
Once you have this reference picture you'd set the white and black levels based on the white and black objects. In Photoshop this would involve the Levels function. I don't have Paintshop Pro so I don't know how it's done there. Write down the values for these points and apply them to photos taken without the objects. This should get you in the ballpark.