Is this reef safe?

[Crabs McJones]

Looking at getting some egg crate, and my local menards has this in stock, it looks like the same stuff sold on BRS, made of Polystyrene and BRS's Egg Crate claims its made of styrene.
So is it ok to use or should I order from BRS

 

[X-37B]

Egg crate is egg crate. I get mine from home depot. You should be good.

 

[stanleo]

got mine from lowe's.

 

[MTBake]

Should be fine. I got mine from Home Depot. Menards has what looks like the same exact stuff.