Hardwood Floor

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I used that clear plastic runner they use on carpets under my 120 and sealed the inside of the stand as much as I could with silicone.
It was flexible and it curved up at the back against the wall above the baseboard.
When I ended up moving the tank the wood was fine. I was kind of surprised cuz I'd had a few spills.
Depending on your setup you could even have a tray with a drain line in the stand.