White Balancing pictures under heavy blue lighting

I am looking at LightRoom to process RAW images from my D3100. I'll be shooting my reef aquarium which is under heavy blue lighting (about 450nm). I can balance the pictures in Capture NX2, however in Lightroom the settings are maxed when using the dropper against an 18% grey card and the picture is not completely balanced.
any suggestions on how I can balance beyond the max of the sliders, or alternatives to balancing?
here is an old picture of the first day I got the lights and was learning the new camera - pre (JPG version from shooting RAW+JPG) and post balance on the RAW picture done in NX2:
*** note that the tank doesn't look this blue, I'm learning that our eyes see things differently than the camera.
Thanks!
pre-process
post process

Just a couple of thoughts:
1. Marine Aquarium lighting (particularly reef-friendly lighting systems) doesn't always broadcast a full spectrum of light. In the same way, gymnasium sodium vapor lights do not broadcast all the colors of the continuous spectrum. In less-than-full spectrum lighting it can be nearly impossible to white balance as you are missing key color components.
2. Water absorbs different colors of light at different rates. What is balanced at the top of an aquarium may be deficient at the bottom of an aquarium. It is possible to have a graduated differential in your white balance in a single shot if you cover a sufficient range of depth. As you go deeper in the tank, the ambient lights (fluorescents and/or tungsten) start to become significant to the overhead aquaria lights.
Neither of those solves your issue today but it should suggest that you might have to live with these limitations when photographing aquarium where you cannot provide your own light.

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