Those are the available options for Macro lenses for Nikon cameras. You can get a 60mm micro (Nikon's term), a 105mm Nikkor Micro or a 105 Sigma Macro (there are other 3rd party alternatives, but I can't speak to their quality).
There is not one single lens that allows for a greater than 1:1 reproduction ratio in the Nikon line. If you want a greater than 1:1 repro ratio you'll need add-ons like close up filters, bellows, extension tubes, or Teleconverters.
You don't need to be close to your subject to product a closeup picture. You need a good macro lens. Also not mentioned in the other thread (because it blows the OPs budget) is the 200mm Nikkor micro lens. There's also a Sigma 150 that takes a nice photo from what I've seen. These two lenses still only do a 1:1 reproduction, they just allow you to shoot further back into your aquarium.
Hope that helps!