Photograph a piece of white paper on auto. You may have to turn off auto focus to get the shot. Be sure to fill the frame. Then perform a custom white balance as per the camera. This should get you close.
To get a better result you will likely need to gel the lens. You can order a Rosco sample pack which will allow you to experiment with different orange gels to see what works for your lights/camera combination. When using gels from this book I cut the gel in half, leaving one half in the book for reference. I like the look that the Light Straw filter gives for my set up. These gels can also make your cell phone photography in the tank better as well.
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