Joe, to add different lenses to the camera there's a button you push that removes a little ring around the camera lens. Then theres an adapter you put onto that and then you can add pretty much any canon lens or filter over that. Is it worth it? Well, I think it would be, especially the macro lens. It would help take really good close pictures of critters in your aquarium. The fuji you're looking at is probly gonna be better than the canons i recommended though. But for college students on a smaller budget the canons are pretty good.
30 L aquarium, 50 lbs LR, 44 lbs LS, 192 W PC, CPR Backpack Skimmer