RAD rock background

[Flounder's Reef]

Hello I was wondering if anyone knows what type of rock they use to created the rock wall background. What do you you guys think about it longevity wise? Seems like a good idea to mount coral

Think they mention it's keystone but where to buy it from?

 

[teleportinghere]

I just googled "keystone tile Nazareth Pennsylvania" and the second link is a construction company (GoliathTech Keystone) that uses keystone material in the base of some of their decks. A July 24th post shows a full keystone patio build. You should give them a call!