Don't use that, its not all foam, it has carbon in it.
You want pure foam without anything else.
No fused layers, no added chemicals, just pure unadulterated foam.
Fluval and Marineland are two companies that make such foam, but there are others.
Very important:
Open the box and look at it if you can.
Any fused layers?
Any crunchy stuff making a sound when you poke it?
Read the description and ingredients on the box before you buy it.