The funny part about 480sparky's suggestion about tossing an AW-1 in to the tank is that the AW-1 is barely in stock a lot of places!!! Thom Hogan's Nikon site has been complaining about how Nikon's country-specific method of allocating stock has meant that AW-1s are realllly tough to find in-stock in much of the USA. I thought that for an early effort with all-new everything (aquarium, tubes,lighting set-up) your first effort turned out pretty well. NEXT UP though, I would love to see some slow speed panning shots + rear-curtain flash synch, with a bit of shutter-dragging! It looks beautiful! I remember seeing some images done that way like 10 years ago, and they were gorgeous!!!
Basically, sloooow speeds, 1/6 to 1/3, panning with the fish, with a mix of continuous lighting AND flash. Saw them on dPreview, I think it was, many moons back.