Styrofoam?

[philg3]

So this week I finally finished painting the stand and got it into the house. next week I have vinegar baths and lots and lots of saltwater to make, but before that i had a question about styrofoam between the tank and stand.

Does everyone do this? Even with trimmed floating bottom tanks? My tank is one of the older Oceanic tanks, I've torn the trim off the top of the tank and DIY'd a euro brace, but I left the bottom trim and was going to paint it black to match the stand. I just got lost on wetwebmedia reading article after article about leveling stands, but they only rarely mention styrofoam and never directly address it and when to use, when not to etc.

Could someone please shed a little light over here?