I'm needing a Macro lens to take close up pictures of inside my fish tank. I have a Canon EOS Rebel. The 2 Lenses I have are the standard 18-55 and I have Canon 55-200 mm f/4.5-5.6 II USM EF Lens When I try using the 55-200, I can't get it to even come close to focusing. If I use the 18-55 I can't get it zoomed in close enough. Am I simply getting too close or do I not have the setting set right? Would love some input. I don't have the cash right now to spend the money on a new lens. Thanks!