Well lets face it I am not liking the pictures I am getting from my tank and no little of photography equipment. Love my camera, cannon eos rebel xsi. Looking for a lens for this this camera that will allow me to get the close up pictures that I so desire. Anyone have any suggestions of a good macro lens they are using. I realize these are really expensive and will be an investment in a few months from now, just want some input of someone that uses them currently.

Thanks
Bobby