16) Do you recommend using a base of sand or lava rock beneath the glass to increase the heat output and decrease the amount of glass needed, or should I plan on using all glass?

In a fireplace you typically do not use “filler” material unless your fireplace has a “drop down” depth or the floor is not level. This is more common in an outdoor fire pit where you have a large void space beneath the burner. You should not cover the burner with anything other than the glass crystals including sand or gravel/ lava rock as this will produce soot over time that will surface on your glass crystals.

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