Tips for full tank shots?

[craiglanda]

Im really coming along as far as learning how to use my new DSLR camera. I have noticed that there are 2 things i am not so great at...One thing is taking pictures of fast moving fish and the other is getting a good picture of my entire display. Macros i get the concept of much better. I cant seem to find the right setting to get a good representation of the full tank. Either the corals look good but i get so much blur from the fish swimming through the frame, or everything is just so dark from using a faster shutter speed in order to get less blur from the fish. If i bump the ISO up everything is just super noisy. I am also having trouble figureing out the white balance when i take a full view pic of the tank. I can set it so the tank looks good but the walls stand and everything else lit by the rooms lights are way off or, the tank looks washed out but the room is balanced correctly. I just cant seem to find that happy medium! Help please!!