What is the proper way to lay the tile in the tank? I heard that you lay a layer of sand down first. What about the cracks though? Do you put grout in it or sand? I'm just worried that the grout will not let the heat escape and possibly shatter the bottom of the tank.
If the tiles are a perfect fit, like 12x12 tiles inside a 30x12x12 tank, then I just layer it with a sheet of paper towels beneath. But it's really not necessary. Some people use sand between the cracks.
Once they establish the defecate spot, just layer a sheet of paper towels on that spot, and all you would have to do is to change that piece of paper towels. Doesn't get much easier than that.
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