06-09-2010, 05:34 AM
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Welcome to TFK!
What's the pH and hardness of your water source? Most aquarium fish prefer either soft, acidic water (tetras, barbs) or hard, basic water (livebearers, African cichlids). If you've got water somewhere in the middle it's likely that most fish will be available to you, but if your local water is at one of the extremes you're somewhat more limited in your options.
To get those numbers, you can take a sample of your water to the LFS (local fish store) for testing (make sure they give you actual numbers) or, even easier, go to your local water board's website, which usually publishes this information.