I have a Nikon D40 purchased to primarily take pics of my fish tank. My goal is to be able to take some truly spectacular shots of my Corals and Fish to build an album. My outside shots seem to be great shooting in Auto mode. MY Reef Shots are CRAP! I use a Vivitar Tripod and I only have the lens that came with the camera kit. I'm going to try and pickup the 55-200mm lens and a Macro lens eventually. What settings should I be shooting my reef in?