I didn't get a shimmer because I turned off all the pumps so there was no surface agitation.
It would depend on the colour of lights you use and the depth of the tank.
I used a Xyrite Colour Checker and shot down on it. The one I got is water proof. It was in about 6" of water off to the side of a 400 watt Radium. Make sure your exposure is correct as it will effect the colour of the shot. Fill the frame with the target.
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