Best is to shoot in RAW mode if your camera can and then adjust the white balance during post processing to match what your eyes see. If your camera does not have RAW shooting mode then you can try playing with the white balance setting and see it that helps.
the best way to get the proper white balance is the same technique used by all photographers for white balancing regardless of the subject, you need to set your custom white balancing in the camera before your start shooting
RAW format involves saving the unprocessed image sensor data so that it can be worked with outside the camera. One of the joys of shooting RAW is YOU set the white balance while post processing. Just move the color temp slider around until the pic looks like what you see.
In camera white balance settings help when one is saving JPGs as the camera then has applied what it thinks is appropriate white balancing before saving the jpg file. And therein lies the rub with photos shot under high color temp lighting such as we use typically with reef tanks. Cameras are not manufactured to white balance properly automatically under "unusual" lighting (like high color temp MHs). Some will do alright up to about about 10,000K but I'm not aware of any that are built to handle color temps above that.
RAW also allows the manipulation of exposure AFTER shooting. Good stuff.
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