REgular styrofoam to support bottom of glass tank ok? URGENT!!!

Is your tank custom built? generally anything that you buy at a store, that has a black plastic frame, it is not recommended to put styrofoam underneath it.
 
It's a custom Starfire tank, had to replace the back and the bottom glass, when I put it back together I skipped the black trim cause they broke in the process of removing. I couldn't find anywhere to buy those plastic trims so I'm just going to skip it and use the styrofoams.


JB NY. Thanks, I got some 5/8" styrofoams.

What's the purpose of putting foams underneath anyways?
 
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