Do you have any fast lenses? Using the ambient would be good if possible, as you said you'll get a lot of reflections if you flash. I'd think a longer exposure will make people all blurry as they move. You'll need to open your aperture as much as possible and set your iso as far as you can take it without getting too grainy.
As for white balance, it would depend on your aquarium and the room/s you're in. If you're only around the one tank then you could use a white card or something at the start, but if you're going to be moving around different tanks that will have different Kalvin bulbs you'd have to adjust each time.
I'd be more inclined to shoot raw and just take a pic of something white under each different tank lights and then set the white balance in post production using presets for each tank.
Cheers
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