Have any of you heard of a product called Pumice Sponge? I found some at Big Lots while buying some Pumice Stone for a new formicarium. I decided to pick some up as it was cheaper than the pumice stone and the shape seemed perfect for formicarium making. The material feels much more coarse than Pumice Stone and it isn't as hard. I'm pretty sure that certain species of ants could chew this stuff up, but I'm not positive. I'm going to build a formicarium out of the Pumice Sponge and do some durability, hydration, and mold resistance tests.