I'm no photo expert but have often thought about taking pics of my fish (don't have dig. camera yet). Anyway, just a thought that maybe someone who's really good with cameras can chime in on. What about no flash, no room lights, opening the shutter aperture (I think some dig. cams let you do that) and increasing the shutter speed (again, some should let you do that). Wouldn't that let the camera make better use of the light from the tank and decrease the probably of motion blur from the fish?