Foam under 2x4 stand?

[balistidae]

I am in the middle of a 60g rimless build. I have built a beefy 2x4 stand with 1/2" ply on the top and bottom. The tank has a piece of 1/2" styrofoam underneath it.

My question is if I can put a piece of 1/2" foam underneath the stand itself? I like the idea of a little extra cushion on our hardwood floors. Is there any downside to doing so?

Thanks!