I don't own a camera (have been using my roommates to take photos), and figured if I'm going to buy one, might as well make it aquarium-friendly. I don't know much about cameras, but I know that manual zoom and a fast shutter speed help a lot with photographing tanks. However, I am on a budget, so I need something that's not overly expensive. Specifically, I don't want to spend more than $200. Any recommendations?