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sub zero, there are a lot of different web sites and books that will help you get started with this hobby. Generally speaking, with more aeration your tank will support more fish. But don't forget about the territorial tendancies of many tropical fish.
There are a lot of good suggestions from others in this thread, and, depending on the fish you want to keep, you will quickly learn what works best for the fish you buy.
I have always liked the undergravel filtration system best.
Beware, this hobby, like many others, has an unlimited number of add-ons and fancy stuff you can buy for your fish. With me it started here and eventually went to a reef aquarium with 'live' rock, corals, etc.. It can get expensive quickly.
Like others already said, start with fish that you don't care much about, and read some of the guides that you can buy in the pet stores.
Good luck with your project!
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