I have a 72" Acrylic tank and acrylic stand/sump I'm putting on ceramic tile. As always, the floor is not perfectly level. It's off by about 1/4 inch in one corner. I was thinking of using neoprene under the entire stand to level it out.
I would use wooden shims and not neoprene as it will crush down and then your tank will be unlevel like mine is. "Fing carpet" Then lay your neoprene down. But before all of this check to see if your tiles are solid and that they do not have air under them. I had a house like that 1 out of ever 10 tiles sounded hollow and when he piano was put in it cracked a couple of them after a couple of months.
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