You should check your LFS (Local Fish Store) and see if they sell RO water. The one in my area sells it 2.50 for 5 gal of RO. Tap water should be out of the question in my opinon. I would use a 4" sandbed and LR, the benifits out way anything else. Just make sure you cycle that tank for around a month or until your levels are good before you put any fish in there. Bio-Spira helps a bunch.
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