Following suggestions from http://www.theminiaturespage.com I tried taking a picture of my tanks with diffuse lighting. The lighting in my light box comes from four 2' tube lights mounted in a square box that you generally see in an office ceiling. To make the light diffuse, I taped thin packing tissue under this box, so the light has to pass through this. I think the tanks look better. I may now be able to fool around with the image to accurately depict what the tank really looks like.