It's possible. Use something white though, a plastic plate comes to mind. Or do like most of us and shoot in raw then adjust the WB in post processing.
Ive used white objects in the aquarium while shooting in raw. If you use the grey card setting then you will have to adjust the white balance afterwards anyways because the corals will be more of their natural color which is much more brown than we would like. Grey card and a little blue shift in the post editing does the trick pretty well...
RAW as well but the sand bed can function as a white card as well if you have enough visible and it is clean. Have been doing that for years prior to RAW.
I set a piece of white 1" pvc near the front glass to set white balance............make sure to zoom in enough to cover the whole view screen in white.
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