You need to get the white balance right. Probably the built in settings (sunny, cloudy, tungsten bulb etc) won't look right, so you'll need to set a custom white balance. You can do this using a grey card under the blue lights or, for a quick and dirty approach, just use the general bluish look of your tank under the moonlights. Here's a quick example:
You can see that the background looks grey. In reality it is a strong blue colour. However, the corals look exactly as they do in real life, and have a lot of pop.
If you have any corals with a blue colouration this might cause problems, and you'd likely get better results using a grey card.
You can also try returning some of the blue to the background by tweaking the levels in lightroom or similar software.
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