05-31-2012, 11:05 PM
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Welcome to the forum
20 gallons is still pretty small :)
I don't want to bombard you with stuff, so I'll just say a few things. First, it's very important that you understand the nitrogen cycle - it is the single most important thing you can know about keeping fish. Honestly, all other advice is inconsequential if you do not understand the nitrogen cycle.
As far as your question is concerned, every week you should be doing some form of maintenance. Most people vacuum the substrate while they are performing a water change. I am assuming you have gravel - everything less dense than water will sink though the gravel to the bottom of the tank. Vacuuming removes that, which needs to be done regularly. How regularly? That depends on how much you over feed. The more you feed, the more waste they produce (and the more decaying fish food in the tank), resulting in more frequent maintenance. The glass can be scraped whenever you want.
As far as cleaning the filter - it's very important that you do not toss out the beneficial bacteria. Really, the only thing that needs to be cleaned in the filter is the mechanical media. Again, understanding the nitrogen cycle and the roll the filter plays is immensely helpful in determining what needs to be cleaned and what doesn't.