There are so many levels of photography it's hard to give one suggestion. I've found that consumer reports usually gives very good and thorough advice on cameras and they are probably going to be a good resource for you. Basically, you've got two options, a "point-and-shoot" and a "single-lens-reflex" or SLR camera. The point and shoot will give you good averaged shots. The SLR will allow you creative and technical control. If you want to take amazing photos of your tank, take a class and learn how to use a SLR camera- WARNING- this is an incredibly expensive, obsessive, technical hobby (just like your tank!) I agree that the Elph is a very nice "point-and-shoot" camera. If I were buying a good SLR camera, I would stick with Nikon, for the point-and-shoots" I like the canon. As far as accessories to shoot your tank, the question is moot if you but the point-and-shoot. You may be able to get a filter or two for that type of camera but nothing will do as good as investing in good digital editing software. For the SLR, the possibilities are endless and it depends on what you want from your shot. If you're going the SLR route, send me some photos you like and I can point you in the right direction as to what type of equipment you should get. Congratulations on your new "toy"! You've got some pretty wonderful parents!
Catherine