Thanks so much everyone.
Here is a brief explination on how these shots were obtained:
Well, as you most likely can guess, I use Nikon products. These photographs were taken with an old D-100 with a 105mm lens. Camera settings were ISO 200, f11 to provide adequate depth of field, and a shutter speed of 125 to freeze movement. As a strobe flash was used, the white balance was set to flash –3 due to the presence of atinic lighting.
The key to getting these particular shots was an additional light source above available tank lighting. The available light would not of allowed the above camera settings so the shots would of either suffered in clarity or lack of depth of field.
A mono light with a soft box attachment was placed above and to the right of the subjects with the eggs in the shot being the primary focus of the light metering to ensure they didn't get washed. Being as water will diffuse light to a degree the lights were metered to be 2 stops higher than f11 out of the water to provide correct exposure after it (the light) had passed through the water.
Really, the key to good/great photography is lighting the subjects correctly. It doesn’t matter how good the camera or technology is, it can only capture what it sees.