What are some of things I need to keep in mind when shooting inside an aquarium? By aquarium, I mean the kind into which people walk in.
I have had the following problems while shooting in such conditions.

* Without a flash, there is a horrible blue cast.
* With flash, everything gets blown out in the foreground and the background is dark.
* I did fiddle with the white balance and managed to get half-decent pics.
* Higher ISO gave really noisy pictures.

I would like to know if there is anything else I could do to improve the pictures.