Great stuff, can hardly wait for part 2. My biggest frustration is dealing with reflections in the glass...
The simplest thing you can do is not be perpendicular to the glass when shooting. Find the angle that works. Second thing is to change the position of the flash. Hard to do if using the on board flash. If you can't move the flash then you just need to experiment with different camera angles to the glass until you minimize the reflections. Getting close to the glass also helps especially with a decent macro lens although I've done it with my standard 50mm prime. To really get rid of all reflections put the camera in the tank and shoot. You won't get reflections at all if the camera is underwater. You will however be buying a new camera. Your choice.
OK I hope you see the humor in that. NEVER EVER put your camera in the aquarium!! Unless of course it's designed for it.
Click on the line in yellow above before you try that last piece of advice