I like your site a lot, because it explains each section in a very simple, and easy to understand way. For people who are not knowledgable with fish and tanks, your site will be very helpful because they will be able to understand even the most complicated components of beginning a tank, which to me is the Biological and Mechanical Filtration, which you descirbed perfectly! Maybe if you are planning on setting up a new tank soon, you can take digital pictures of the process and make a guide to physcially setting it up. Like adding substrate, decorations, water, and plants. You also could add links to help readers continue their research, such as a link to The Krib for plants, Aquaria Central for fish help, and Fishprofiles.com for fish profiles (maybe even Takashi Amanos Nature Aquarium's site for enthusiatic readers). It looks good! The only thing I'd add is under the substrate section, a part about how you can add fertilizers such as Sera, or Fluorite as substrate to the tank, then a small layer of gravel over the top of it to help the plants grow more, and maybe something about adding liquid fertilizers to help growth, and CO2. Awesome job!