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For balancing the lights of the tank with the room you could try metering of the aquarium and deciding the good exposure factors and setting them with the camera ini manual mode. then have the flash in manual mode and try different flash power to have the desired room lighting. bouncing the flash up on the ceiling gives you diffuse lighting in the room and avoides reflection on the tank glass. it also works better to have the flash off camera directed towards the ceiling or on a white wall to act as a big reflector. its not easily achieved if your using the built in flash.
Another method would be to take few pictures with the camera on tripod. making sure there is not the least motion between the pictures. you could take one picture with metering for the tank. another with metering for the room. also you could take a multitude of pictures with different focus point. all of these pictures will be the same position with different focus or exposure so fusing them and playing with individual layers opacities will give you the effect you desire. This will result in some of your fish having a few duplicates as tehy will be in different positions on each picture.
one other way of doing it is to take one raw picture and process it differently to generate one picture with good exposure fo rhte tank and another with good exposure for the room and then fuse them.
You also could use the braketting function to get three shots in rapid succession with 3 different exposures without having to mess with the camera settings and cause it to move. you can always set the amount of braketting difference you need.
Hope this helps.
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