Hey great photo's, great tanks I love them. I am shocked to see you have the exact same camera as me, I havnt' been able to get as nice shots and I have some basic photography knowledge, I used Manual setting and Macro for all my shots and adjusted the shutter speed, ISO, and f stop.
However you say you used Macro and the underwater selection, do you have the underwater box? Or you are just using the setting? Did you use the flash? Bright lights? Hmmmm it's too late for me to get looking at mine now but I am intrigued I want photo's like yours.. lol There is no way I could get mine as crisp and full frame on the cory like you have are you zooming in past the 4.0x and so using the digital zoom?