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Go to Home Depot or Lowes, and buy a 12" X 12" sheet of 1" square slate tiles for about $11. Makes 144 square "discs" for 8 or 9 cents apiece. The slate is very soft, and you can drill custom size depressions in it to a better job of holding whatever you're fragging, and you don't have to worry about water chemistry issues at all. The slate is soft enough that once the frag has grown onto to slate, the corners can be snipped off very easily with side cutters if so desired
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Why can't my wife see this stuff as an investment?
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