White out blocker
Cut a note card to a size that will cover any angle between the flash and the frame to be photoed. Holding this card in front of the flash will difuse the light and reduce the over exposure. Be careful not to put the card infront of the lens. Scotch tape can be used if you need a few photos taken.
Fish have a good sence of smell and no nose, a good sence of hearing and no ears, and good vision. They could not manage the last one without eyes.