How to set white balance when shooting video of aquarium

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#1
I've always used Auto mode when shooting video of my tank, but whenever I move my camera it changes the white balance, hence my Hippo Tang will go from correct blue to washed out blue to purple, etc. Also my black background appears blue. I tried taking a measurement reference photo of my substrate but I can't fill my viewfinder with it so the camera won't take the picture. I don't see holding a piece of white paper to the side of the tank as being the solution.

What do you all do to set the white balance?
 
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