Foam is for between stands and tanks for wall on bottom glass tanks with no trim. It supports the tank from pressure points.
Putting foam on the floor under the stand isn't going to really do much, you need to shim. Also, shimming only needs to be done under vertical members on wood framed stands and around the entire stand if the stand is a ply construction without a frame.
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Hobby Experience: 9200ish gallons, 26 skimmers, and a handful of Kent Scrapers.
Current Tank:
Vortech Powered 600G SPS Tank w/ 100gal frag tank & 100g Sump. RK2-RK10 Skimmer. ReefAngel. Radium 20k.
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