So you set up the lighting just right for an area of the tank, set up the camera, and ..... wait for it?
You have a remote trigger of some sort?
The times I've tried to photograph my tanks, it's taken LOTS of patience. Lots of bad shots--great shot, but the light looks wierd. Great shot, but there's a splotch on the glass, another fish was in the way just a little.
This takes a lot of skill and experience to do well. Though my photography has not been very rewarding, it has deepened my appreciation for those who do it right.
These photos are incredible, Mo.